Zoom optical system, optical apparatus and method for manufacturing the zoom optical system

ABSTRACT

A zoom optical system (ZL) comprises, in order from an object: a first lens group (G1) having a positive refractive power; and a second lens group (G2) having a negative refractive power, wherein upon zooming, a distance between the adjacent lens groups changes. The zoom optical system further comprises an aperture stop (S) disposed closer to an image than the second lens group (G2, and satisfies the following conditional expression:0.10&lt;Df/Dr&lt;0.90where Df: a distance to the aperture stop from a lens surface of the zoom optical system closest to an object in a wide angle end state, andDr: a distance from the aperture stop to a lens surface of the zoom optical system closest to the image in the wide angle end state.

TECHNICAL FIELD

The present invention relates to a zoom optical system, an optical apparatus including the same, and a method for manufacturing the zoom optical system.

TECHNICAL BACKGROUND

Conventionally, zoom optical systems suitable for photographic cameras, electronic still cameras, video cameras and the like have been proposed (for example, see Patent literature 1). If the zooming capability and the angle of view of the zoom optical system are increased, it is difficult to achieve a favorable optical performance, and the zoom optical system tends to increase in size.

PRIOR ARTS LIST Patent Document

Patent literature 1: Japanese Laid-Open Patent Publication No. H09-184981(A)

SUMMARY OF THE INVENTION

A zoom optical system according to a first aspect comprises, in order from an object: a first lens group having a positive refractive power; and a second lens group having a negative refractive power, wherein upon zooming, a distance between the adjacent lens groups change, and the zoom optical system further comprises an aperture stop disposed closer to an image than the second lens group, and satisfies the following conditional expression:

0.10<Df/Dr<0.90

where Df: a distance to the aperture stop from a lens surface of the zoom optical system closest to an object in a wide angle end state, and

Dr: a distance from the aperture stop to a lens surface of the zoom optical system closest to the image in the wide angle end state.

An optical apparatus according to a second aspect comprises the zoom optical system mounted thereon.

A method for manufacturing a zoom optical system according to a third aspect comprises, in order from an object: a first lens group having a positive refractive power; and a second lens group having a negative refractive power, the method comprising, arranging the lens groups in a lens barrel such that: upon zooming, a distance between the adjacent lens groups changes, configuring the zoom optical system to comprise an aperture stop disposed closer to an image than the second lens group, and satisfying the following conditional expression:

0.10<Df/Dr<0.90

where Df: a distance to the aperture stop from a lens surface of the zoom optical system closest to an object in a wide angle end state, and

Dr: a distance from the aperture stop to a lens surface of the zoom optical system closest to the image in the wide angle end state.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a lens configuration diagram of a zoom optical system according to a first example upon focusing on infinity in a wide angle end state;

FIGS. 2A and 2B are various aberration graphs of the zoom optical system according to the first example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 3A and 3B are coma aberration graphs of the zoom optical system according to the first example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 4 is a lens configuration diagram of a zoom optical system according to a second example upon focusing on infinity in a wide angle end state;

FIGS. 5A and 5B are various aberration graphs of the zoom optical system according to the second example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 6A and 6B are coma aberration graphs of the zoom optical system according to the second example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 7 is a lens configuration diagram of a zoom optical system according to a third example upon focusing on infinity in a wide angle end state;

FIGS. 8A and 8B are various aberration graphs of the zoom optical system according to the third example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 9A and 9B are coma aberration graphs of the zoom optical system according to the third example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 10 is a lens configuration diagram of a zoom optical system according to a fourth example upon focusing on infinity in a wide angle end state;

FIGS. 11A and 11B are various aberration graphs of the zoom optical system according to the fourth example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 12A and 12B are coma aberration graphs of the zoom optical system according to the fourth example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 13 is a lens configuration diagram of a zoom optical system according to a fifth example upon focusing on infinity in a wide angle end state;

FIGS. 14A and 14B are various aberration graphs of the zoom optical system according to the fifth example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 15A and 15B are coma aberration graphs of the zoom optical system according to the fifth example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 16 is a lens configuration diagram of a zoom optical system according to a sixth example upon focusing on infinity in a wide angle end state;

FIGS. 17A and 17B are various aberration graphs of the zoom optical system according to the sixth example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 18A and 18B are coma aberration graphs of the zoom optical system according to the sixth example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 19 is a lens configuration diagram of a zoom optical system according to a seventh example upon focusing on infinity in a wide angle end state;

FIGS. 20A and 20B are various aberration graphs of the zoom optical system according to the seventh example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 21A and 21B are coma aberration graphs of the zoom optical system according to the seventh example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 22 is a lens configuration diagram of a zoom optical system according to an eighth example upon focusing on infinity in a wide angle end state;

FIGS. 23A and 23B are various aberration graphs of the zoom optical system according to the eighth example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 24A and 24B are coma aberration graphs of the zoom optical system according to the eighth example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 25 is a lens configuration diagram of a zoom optical system according to a ninth example upon focusing on infinity in a wide angle end state;

FIGS. 26A and 26B are various aberration graphs of the zoom optical system according to the ninth example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 27A and 27B are coma aberration graphs of the zoom optical system according to the ninth example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 28 is a lens configuration diagram of a zoom optical system according to a tenth example upon focusing on infinity in a wide angle end state;

FIGS. 29A and 29B are various aberration graphs of the zoom optical system according to the tenth example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 30A and 30B are coma aberration graphs of the zoom optical system according to the tenth example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 31 is a lens configuration diagram of a zoom optical system according to an eleventh example upon focusing on infinity in a wide angle end state;

FIGS. 32A and 32B are various aberration graphs of the zoom optical system according to the eleventh example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 33A and 33B are coma aberration graphs of the zoom optical system according to the eleventh example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 34 is a lens configuration diagram of a zoom optical system according to a twelfth example upon focusing on infinity in a wide angle end state;

FIGS. 35A and 35B are various aberration graphs of the zoom optical system according to the twelfth example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 36A and 36B are coma aberration graphs of the zoom optical system according to the twelfth example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 37 is a lens configuration diagram of a zoom optical system according to a thirteenth example upon focusing on infinity in a wide angle end state;

FIGS. 38A and 38B are various aberration graphs of the zoom optical system according to the thirteenth example upon focusing on infinity in the wide-angle end state and a telephoto end state;

FIGS. 39A and 39B are coma aberration graphs of the zoom optical system according to the thirteenth example in the wide-angle end state and the telephoto end state when blur correction is performed;

FIG. 40 shows a configuration of a camera that comprises a zoom optical system according to this embodiment; and

FIG. 41 is a flowchart showing a method for manufacturing the zoom optical system according to this embodiment.

DESCRIPTION OF THE EMBODIMENTS

Hereinafter, a zoom optical system and an optical apparatus according to this embodiment will be described with reference to the drawings. First, a camera (optical apparatus) comprising the zoom optical system according to this embodiment is described with reference to FIG. 40. As shown in FIG. 40, the camera 1 is a digital camera that comprises the zoom optical system according to this embodiment as a photographing lens 2. In the camera 1, light from an object (photographic object), not shown, is collected by the photographing lens 2, and reaches an image pickup element 3. Accordingly, the light from the photographic object is captured by an image pickup element 3, and is recorded as a photographic object image in a memory, not shown. A photographer can thus take an image of the photographic object through the camera 1. Note that the camera may be a mirrorless camera, or a single-lens reflex type camera that includes a quick return mirror.

Next, the zoom optical system (photographing lens) according to this embodiment is described. As shown in FIG. 1, the zoom optical system ZL(1) as an example of the zoom optical system (zoom lens) ZL according to this embodiment comprises, in order from the object: a first lens group G1 having a positive refractive power; and a second lens group G2 having a negative refractive power. Upon zooming, a distance between the adjacent lens groups changes. The zoom optical system ZL(1) further comprises an aperture stop (aperture stop S) disposed closer to an image than the second lens group G2. Accordingly, variation in astigmatism and spherical aberration upon zooming can be suppressed.

In the configuration described above, the zoom optical system ZL according to this embodiment satisfies the following conditional expression (1).

0.10<Df/Dr<0.90  (1)

where Df: a distance to the aperture stop from a lens surface of the zoom optical system ZL closest to an object in a wide angle end state, and

Dr: a distance from the aperture stop to a lens surface of the zoom optical system ZL closest to the image in the wide angle end state.

According to this embodiment, the zoom optical system that has a high zooming ratio and a favorable optical performance, and the optical apparatus that comprises the zoom optical system can be obtained. The zoom optical system ZL according to this embodiment may be a zoom optical system ZL(2) shown in FIG. 4, a zoom optical system ZL(3) shown in FIG. 7, a zoom optical system ZL(4) shown in FIG. 10, or a zoom optical system ZL(5) shown in FIG. 13. The zoom optical system ZL according to this embodiment may be a zoom optical system ZL(6) shown in FIG. 16, a zoom optical system ZL(7) shown in FIG. 19, a zoom optical system ZL(8) shown in FIG. 22, or a zoom optical system ZL(9) shown in FIG. 25. The zoom optical system ZL according to this embodiment may be a zoom optical system ZL(10) shown in FIG. 28, a zoom optical system ZL(11) shown in FIG. 31, a zoom optical system ZL(12) shown in FIG. 34, or a zoom optical system ZL(13) shown in FIG. 37.

The conditional expression (1) defines the position of the aperture stop in the wide-angle end state. By satisfying the conditional expression (1), variation in spherical aberration and field curves upon zooming can be suppressed.

If the corresponding value of the conditional expression (1) falls below the lower limit value, it is difficult to suppress variation in field curves upon zooming. By setting the lower limit value of the conditional expression (1) to 0.20, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (1) may be set to 0.30, 0.40, 0.50, 0.53, 0.55, 0.58, 0.60, 0.61, 0.62, 0.63, and further to 0.64.

If the corresponding value of the conditional expression (1) exceeds the upper limit value, it is difficult to suppress variation in field curves upon zooming. By setting the upper limit value of the conditional expression (1) to 0.89, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (1) may be set to 0.88, 0.87, 0.86, 0.85, 0.83, 0.80, 0.78, and further to 0.75.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein the aperture stop is disposed between the second lens group G2 and the fourth lens group G4. Accordingly, variation in astigmatism and spherical aberration upon zooming can be suppressed.

Preferably, the zoom optical system ZL according to this embodiment satisfies the following conditional expression (2).

1.00<TLw/fw<7.50  (2)

where TLw: an entire length of the zoom optical system ZL in the wide angle end state, and

fw: a focal length of the zoom optical system ZL in the wide-angle end state.

The conditional expression (2) defines the ratio between the entire length of the zoom optical system ZL in the wide angle end state and the focal length of the zoom optical system ZL. By satisfying the conditional expression (2), the field curves in the wide angle end state can be favorably corrected while the zoom optical system ZL is reduced in size.

If the corresponding value of the conditional expression (2) falls below the lower limit value, it is difficult to correct the field curves. By setting the lower limit value of the conditional expression (2) to 1.50, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (2) may be set to 2.00, 2.50, 3.00, 3.50, 4.00, 4.30, 4.50, 4.60, and further to 4.70.

If the corresponding value of the conditional expression (2) exceeds the upper limit value, it is difficult to correct the field curves. By setting the upper limit value of the conditional expression (2) to 7.30, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (2) may be set to 7.00, 6.80, 6.50, 6.30, 6.00, 5.80, 5.50, 5.40, 5.30, and further to 5.25.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein the zoom optical system ZL satisfies the following conditional expression (3).

1.00<Mv4/Mv3<3.00  (3)

where Mv3: an amount of movement of the third lens group G3 upon zooming from the wide angle end state to a telephoto end state (a sign of the amount of movement toward an object is shown as +), and

Mv4: an amount of movement of the fourth lens group G4 upon zooming from the wide angle end state to a telephoto end state (a sign of the amount of movement toward an object is shown as +).

The conditional expression (3) defines the ratio between the amount of movement of the third lens group G3 and the amount of movement of the fourth lens group G4 upon zooming from the wide angle end state to the telephoto end state. By satisfying the conditional expression (3), variation in spherical aberration and field curves upon zooming can be suppressed.

If the corresponding value of the conditional expression (3) falls below the lower limit value, it is difficult to suppress variation in field curves upon zooming. By setting the lower limit value of the conditional expression (3) to 1.05, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (3) may be set to 1.10, 1.15, 1.18, 1.20, 1.23, 1.25, 1.28, 1.30, 1.33 and further to 1.35.

If the corresponding value of the conditional expression (3) exceeds the upper limit value, it is difficult to correct the field curves in the wide angle end state. By setting the upper limit value of the conditional expression (3) to 2.80, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (3) may be set to 2.50, 2.30, 2.00, 1.80, 1.65, 1.62, 1.60, 1.58, 1.55, 1.53, and further to 1.50.

Preferably, the zoom optical system ZL according to this embodiment satisfies the following conditional expression (4).

0.00<Mv2/fw<10.00  (4)

where Mv2: an amount of movement of the second lens group G2 upon zooming from the wide angle end state to a telephoto end state (a sign of the amount of movement toward an object is shown as +), and

fw: a focal length of the zoom optical system ZL in the wide-angle end state.

The conditional expression (4) defines the amount of movement of the second lens group G2 upon zooming from the wide angle end state to the telephoto end state. Note that the conditional expression (4) means that the second lens group G2 moves toward the object upon zooming from the wide angle end state to the telephoto end state. By satisfying the conditional expression (4), the spherical aberration in the telephoto end state can be favorably corrected.

If the corresponding value of the conditional expression (4) falls below the lower limit value, it is difficult to correct the spherical aberration in the telephoto end state. By setting the lower limit value of the conditional expression (4) to 0.05, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (4) may be set to 0.08, 0.10, 0.13, 0.15, 0.18, 0.20, 0.22 and further to 0.24.

If the corresponding value of the conditional expression (4) exceeds the upper limit value, it is difficult to correct the spherical aberration in the telephoto end state. By setting the upper limit value of the conditional expression (4) to 8.00, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (4) may be set to 5.00, 3.00, 2.50, 2.20, 2.00, 1.80, 1.50, 1.30, 1.10, 0.95, 0.90, 0.85, 0.80, 0.75, and further to 0.70.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein upon zooming, a plurality of the lens groups in the zoom optical system ZL move, and distances of the adjacent lens groups change, and the lens group closest to the image among the lens groups moving upon zooming, and the aperture stop integrally move upon zooming. Accordingly, the lens barrel including the mechanism can be reduced in size while a favorable optical performance is secured.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein upon zooming, a plurality of the lens groups including the third lens group G3 in the zoom optical system ZL move, and distances of the adjacent lens groups change, and the lens group closest to the image among the lens groups moving upon zooming, and the third lens group G3 integrally move upon zooming. Accordingly, the lens barrel including the mechanism can be reduced in size while a favorable optical performance is secured.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein the sixth lens group G6 consists of two or more lenses. Accordingly, occurrence of the field curves and the chromatic aberration of magnification can be suppressed.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein the sixth lens group G6 and the aperture stop integrally move upon zooming. Accordingly, the lens barrel including the mechanism can be reduced in size while a favorable optical performance is secured.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein the sixth lens group G6 and the third lens group G3 integrally move upon zooming. Accordingly, the lens barrel including the mechanism can be reduced in size while a favorable optical performance is secured.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein the aperture stop and the third lens group G3 integrally move upon zooming. Accordingly, the lens barrel including the mechanism can be reduced in size while a favorable optical performance is secured.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein the third lens group G3 includes a vibration-proof group that has a positive refractive power and is movable so as to have a displacement component in a direction perpendicular to an optical axis. Accordingly, variation in the field curves before and after blur correction can be suppressed.

Preferably, the zoom optical system ZL according to this embodiment satisfies the following conditional expression (5).

0.50<f3b/f3<4.00  (5)

where f3b: a focal length of the vibration-proof group, and

f3: a focal length of the third lens group G3.

The conditional expression (5) defines the ratio between the focal length of the vibration-proof group and the focal length of the third lens group G3. By satisfying the conditional expression (5), variation in spherical aberration before and after blur correction can be suppressed.

If the corresponding value of the conditional expression (5) falls below the lower limit value, it is difficult to suppress variation in spherical aberration before and after blur correction. By setting the lower limit value of the conditional expression (5) to 0.60, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (5) may be set to 0.70, 0.80, 0.85, 0.90, 0.95, 0.99, 1.10, 1.20, and further to 1.30.

If the corresponding value of the conditional expression (5) exceeds the upper limit value, it is difficult to achieve the advantageous effects of blur correction. By setting the upper limit value of the conditional expression (5) to 3.80, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (5) may be set to 3.50, 3.40, 3.00, 2.80, 2.40, 2.10, 1.80, and further to 1.60.

Preferably, the zoom optical system ZL according to this embodiment satisfies the following conditional expression (6).

0.50<βT3r×(1−βT3b)<4.00  (6)

where βT3r: a magnification of the lens groups consisting of lenses disposed closer to the image than the vibration-proof group in a telephoto end state, and

βT3b: a magnification of the vibration-proof group in the telephoto end state.

The conditional expression (6) defines the magnification of the lens groups consisting of lenses arranged closer to the image than the vibration-proof group and the magnification of the vibration-proof group in the telephoto end state. By satisfying the conditional expression (6), variation in spherical aberration before and after blur correction can be suppressed.

If the corresponding value of the conditional expression (6) falls below the lower limit value, it is difficult to suppress variation in spherical aberration before and after blur correction. By setting the lower limit value of the conditional expression (6) to 0.60, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (6) may be set to 0.70, 0.80, 0.90, 0.95, 0.98, 1.05, 1.10, 1.20, and further to 1.30.

If the corresponding value of the conditional expression (6) exceeds the upper limit value, it is difficult to suppress variation in spherical aberration before and after blur correction. By setting the upper limit value of the conditional expression (6) to 3.50, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (6) may be set to 3.00, 2.50, 2.10, 1.90, 1.80, 1.70, and further to 1.60.

Preferably, in the zoom optical system ZL according to this embodiment, the vibration-proof group includes a positive lens and a negative lens. Accordingly, occurrence of the spherical aberration in the vibration-proof group can be suppressed, and variation in spherical aberration before and after blur correction can be suppressed. By achromatization at the vibration-proof group, variation in chromatic aberration before and after blur correction can be suppressed.

Preferably, in the zoom optical system ZL according to this embodiment, the third lens group G3 consists of, in order from the object: a 3a group, a 3b group, and a 3c group, and the 3b group is the vibration-proof group. Accordingly, variation in the spherical aberration before and after blur correction can be suppressed.

Preferably, the zoom optical system ZL according to this embodiment satisfies the following conditional expression (7).

0.20<(−f3c)/f3b<1.50  (7)

where f3c: a focal length of the 3c group, and

f3b: a focal length of the vibration-proof group.

The conditional expression (7) defines the ratio between the focal length of the 3c group and the focal length of the vibration-proof group. By satisfying the conditional expression (7), variation in spherical aberration before and after blur correction can be suppressed.

If the corresponding value of the conditional expression (7) falls below the lower limit value, correction in the 3c group for the spherical aberration caused at the vibration-proof group (3b group) upon blur correction becomes excessive. By setting the lower limit value of the conditional expression (7) to 0.25, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (7) may be set to 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, and further to 0.62.

If the corresponding value of the conditional expression (7) exceeds the upper limit value, correction in the 3c group for the spherical aberration caused at the vibration-proof group (3b group) upon blur correction becomes excessive. By setting the upper limit value of the conditional expression (7) to 1.40, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (7) may be set to 1.30, 1.25, 1.21, 1.10, 1.00, 0.95, 0.90, 0.85, 0.80, and further to 0.75.

Preferably, in the zoom optical system ZL according to this embodiment, the 3c group consists of a single lens. Accordingly, with the minimum lens configuration, the spherical aberration caused at the vibration-proof group (3b group) upon blur correction can be corrected.

Preferably, in the zoom optical system ZL according to this embodiment, the 3c group consists of a negative single lens. Accordingly, with the minimum lens configuration, the spherical aberration caused at the vibration-proof group (3b group) upon blur correction can be favorably corrected.

Preferably, in the zoom optical system ZL according to this embodiment, the 3c group consists of a negative single lens, and the zoom optical system ZL satisfies the following conditional expression (8).

−1.50<(R3c2+R3c1)/(R3c2−R3c1)<5.50  (8)

where R3c1: a radius of curvature of an object-side lens surface of the negative single lens of the 3c group, and

R3c2: a radius of curvature of an image-side lens surface of the negative single lens of the 3c group.

The conditional expression (8) defines the shape factor of the negative single lens of the 3c group. By satisfying the conditional expression (8), variation in spherical aberration and field curves before and after blur correction can be suppressed.

If the corresponding value of the conditional expression (8) falls below the lower limit value, it is difficult to suppress variation in spherical aberration and field curves before and after blur correction. By setting the lower limit value of the conditional expression (8) to −1.10, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (8) may be set to −0.60, −0.10, 0.10, 0.90, and further to 1.10.

If the corresponding value of the conditional expression (8) exceeds the upper limit value, it is difficult to suppress variation in spherical aberration and field curves before and after blur correction. By setting the upper limit value of the conditional expression (8) to 5.30, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (8) may be set to 5.00, 4.50, 4.00, 3.50, 3.00, 2.50, 2.20, and further to 2.00.

Preferably, the zoom optical system ZL according to this embodiment satisfies the following conditional expression (9).

3.00<ft/fw<30.00  (9)

where ft: a focal length of the zoom optical system ZL in a telephoto end state, and

fw: a focal length of the zoom optical system ZL in the wide-angle end state.

The conditional expression (9) defines the zooming ratio of the zoom optical system ZL. By satisfying the conditional expression (9), the advantageous effects of this embodiment can be exerted to the maximum at a high zooming ratio. By setting the lower limit value of the conditional expression (9) to 3.30, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (9) may be set to 3.50, 4.00, 4.50, 5.00, 6.00, and further to 7.00. By setting the upper limit value of the conditional expression (9) to 25.00, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (9) may be set to 20.00, 15.00, 10.00, 9.00, and further to 8.00.

Preferably, the zoom optical system ZL according to this embodiment satisfies the following conditional expression (10).

35.0°<ωw<75.0°  (10)

where ωw: a half angle of view of the zoom optical system ZL in a wide-angle end state.

The conditional expression (10) defines the half angle of view of the zoom optical system ZL in the wide-angle end state. By satisfying the conditional expression (10), the field curves can be favorably corrected. By setting the lower limit value of the conditional expression (10) to 38.0°, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (10) may be set to 40.0°. By setting the upper limit value of the conditional expression (10) to 70.0°, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (10) may be set to 60.0°, 50.0°, and further to 45.0°.

Preferably, the zoom optical system ZL according to this embodiment satisfies the following conditional expression (11).

2.5°<ωt<15.0°  (11)

where ωt: a half angle of view of the zoom optical system ZL in a telephoto end state.

The conditional expression (11) defines the half angle of view of the zoom optical system ZL in the telephoto end state. By satisfying the conditional expression (11), the advantageous effects of this embodiment can be exerted to the maximum at a high zooming ratio. By setting the lower limit value of the conditional expression (11) to 4.0°, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (11) may be set to 5.0° and further to 5.5°. By setting the upper limit value of the conditional expression (11) to 13.0°, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (11) may be set to 12.0°, 11.0°, 10.0°, and further to 9.0°.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; and a third lens group G3 having a positive refractive power, wherein the zoom optical system ZL satisfies the following conditional expression (12).

−0.30<fw/f123w<0.60  (12)

where fw: a focal length of the zoom optical system ZL in the wide-angle end state, and

f123w: a combined focal length of the first lens group G1, the second lens group G2 and the third lens group G3 in the wide angle end state.

The conditional expression (12) defines the ratio between the focal length of the zoom optical system ZL and the combined focal length of the first lens group G1, the second lens group G2 and the third lens group G3 in the wide angle end state. Note that the conditional expression (12) means that the first lens group G1, the second lens group G2 and the third lens group G3 are substantially afocal in the wide angle end state. By satisfying the conditional expression (12), the spherical aberration and field curves in the wide angle end state can be favorably corrected.

If the corresponding value of the conditional expression (12) falls below the lower limit value, it is difficult to correct the spherical aberration in the wide angle end state. By setting the lower limit value of the conditional expression (12) to −0.28, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (12) may be set to −0.25, −0.20, −0.15, and further to −0.12.

If the corresponding value of the conditional expression (12) exceeds the upper limit value, it is difficult to correct the spherical aberration in the wide angle end state. By setting the upper limit value of the conditional expression (12) to 0.55, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (12) may be set to 0.50, 0.45, 0.40, 0.35, 0.30, 0.25, 0.20, 0.15, 0.10, and further to 0.05.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; and a third lens group G3 having a positive refractive power, wherein the zoom optical system ZL satisfies the following conditional expression (13).

−1.50<ft/f123t<1.00  (13)

where ft: a focal length of the zoom optical system ZL in a telephoto end state, and

f123t: a combined focal length of the first lens group G1, the second lens group G2 and the third lens group G3 in the telephoto end state.

The conditional expression (13) defines the ratio between the focal length of the zoom optical system ZL and the combined focal length of the first lens group G1, the second lens group G2 and the third lens group G3 in the telephoto end state. Note that the conditional expression (13) means that the first lens group G1, the second lens group G2 and the third lens group G3 are substantially afocal in the telephoto end state. By satisfying the conditional expression (13), the spherical aberration and field curves in the telephoto end state can be favorably corrected.

If the corresponding value of the conditional expression (13) falls below the lower limit value, it is difficult to correct the spherical aberration in the telephoto end state. By setting the lower limit value of the conditional expression (13) to −1.35, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (13) may be set to −1.00, −0.90, and further to −0.80.

If the corresponding value of the conditional expression (13) exceeds the upper limit value, it is difficult to correct the spherical aberration in the telephoto end state. By setting the upper limit value of the conditional expression (13) to 0.50, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (13) may be set to 0.20, 0.10, −0.10, and further to −0.20.

Preferably, the zoom optical system ZL according to this embodiment satisfies the following conditional expression (14).

0.20<BFw/fw<0.60  (14)

where BFw: a distance to an image surface from a lens surface of the zoom optical system ZL closest to the image in the wide angle end state, and

fw: a focal length of the zoom optical system ZL in the wide-angle end state.

The conditional expression (14) defines the ratio between the back focus of the zoom optical system ZL and the focal length of the zoom optical system ZL in the wide angle end state. By satisfying the conditional expression (14), the field curves in the wide angle end state can be efficiently corrected.

If the corresponding value of the conditional expression (14) falls below the lower limit value, it is difficult to correct the field curves in the wide angle end state. By setting the lower limit value of the conditional expression (14) to 0.25, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (14) may be set to 0.30, 0.35, 0.37, and further to 0.40.

If the corresponding value of the conditional expression (14) exceeds the upper limit value, correction of the field curves in the wide angle end state becomes insufficient. By setting the upper limit value of the conditional expression (14) to 0.56, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (14) may be set to 0.54, 0.52, and further to 0.50.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; and a fifth lens group G5, wherein upon focusing, the fifth lens group G5 moves with respect to the image surface. Accordingly, variation in spherical aberration upon focusing can be suppressed.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; and a fifth lens group G5, wherein the fifth lens group G5 includes at least one positive lens, and at least one negative lens. Accordingly, variation in field curves upon focusing can be suppressed.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; and a fifth lens group G5, wherein the zoom optical system ZL satisfies the following conditional expression (15).

1.00<(−f5)/fw<16.00  (15)

where f5: a focal length of the fifth lens group G5, and

fw: a focal length of the zoom optical system ZL in the wide-angle end state.

The conditional expression (15) defines the ratio between the focal length of the fifth lens group G5 and the focal length of the zoom optical system ZL in the wide-angle end state. By satisfying the conditional expression (15), the field curves caused upon focusing can be favorably corrected.

If the corresponding value of the conditional expression (15) falls below the lower limit value, it is difficult to suppress the field curves caused upon focusing. By setting the lower limit value of the conditional expression (15) to 1.10, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (15) may be set to 1.20, 1.30, 1.40, and further to 1.45.

If the corresponding value of the conditional expression (15) exceeds the upper limit value, correction of the field curves upon focusing becomes insufficient. The amount of movement of the fifth lens group G5 upon focusing increases, which in turn increases the size of the lens barrel. By setting the upper limit value of the conditional expression (15) to 15.50, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (15) may be set to 10.00, 8.00, 5.00, 4.00, 3.00, 2.45, 2.38, 2.33, 2.28, 2.25, and further to 2.10.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein the zoom optical system ZL satisfies the following conditional expression (16).

1.00<Mv5/Mv6<3.00  (16)

where Mv5: an amount of movement of the fifth lens group G5 upon zooming from the wide angle end state to a telephoto end state (a sign of the amount of movement toward an object is shown as +), and

Mv6: an amount of movement of the sixth lens group G6 upon zooming from the wide angle end state to a telephoto end state (a sign of the amount of movement toward an object is shown as +).

The conditional expression (16) defines the ratio between the amount of movement of the fifth lens group G5 and the amount of movement of the sixth lens group G6 upon zooming from the wide angle end state to the telephoto end state. By satisfying the conditional expression (16), the field curves can be favorably corrected.

If the corresponding value of the conditional expression (16) falls below the lower limit value, it is difficult to suppress the field curves caused in the fifth lens group G5. By setting the lower limit value of the conditional expression (16) to 1.10, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (16) may be set to 1.20, 1.30, and further to 1.40.

If the corresponding value of the conditional expression (16) exceeds the upper limit value, it is difficult to correct the field curves in the fifth lens group G5. By setting the upper limit value of the conditional expression (16) to 2.50, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (16) may be set to 2.00, 1.80, and further to 1.60.

Preferably, in the zoom optical system ZL according to this embodiment, upon zooming, the first lens group G1 moves with respect to the image surface. Accordingly, a high zooming ratio can be achieved.

Preferably, in the zoom optical system ZL according to this embodiment, the first lens group G1 consists of three or more lenses. Accordingly, particularly in the telephoto end state, the spherical aberration can be favorably corrected. Furthermore, a high zooming ratio can be achieved.

Preferably, the zoom optical system ZL according to this embodiment satisfies the following conditional expression (17).

0.30<Mv1/(ft−fw)<0.80  (17)

where Mv1: an amount of movement of the first lens group G1 upon zooming from the wide angle end state to a telephoto end state (a sign of the amount of movement toward an object is shown as +), and

ft: a focal length of the zoom optical system ZL in a telephoto end state.

fw: a focal length of the zoom optical system ZL in the wide-angle end state.

The conditional expression (17) defines the amount of movement of the first lens group G1 with respect to variation in focal length upon zooming from the wide angle end state to the telephoto end state. By satisfying the conditional expression (17), the spherical aberration and field curves in the telephoto end state can be favorably corrected.

If the corresponding value of the conditional expression (17) falls below the lower limit value, it is difficult to correct the spherical aberration in the telephoto end state. By setting the lower limit value of the conditional expression (17) to 0.32, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (17) may be set to 0.33, 0.34, and further to 0.35.

If the corresponding value of the conditional expression (17) exceeds the upper limit value, it is difficult to correct the field curves in the telephoto end state. Furthermore, the diameter of the first lens group G1 increases, which in turn increases the weight of the lens barrel. By setting the upper limit value of the conditional expression (17) to 0.77, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (17) may be set to 0.70, 0.65, 0.58, 0.50, 0.45, and further to 0.40.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein an air lens is provided in the sixth lens group G6, and the zoom optical system ZL satisfies the following conditional expression (18).

0.00<(RAr2+RAr1)/(RAr2−RAr1)<2.00  (18)

where RAr1: a radius of curvature of an object-side lens surface of the air lens of the sixth lens group G6, and

RAr2: a radius of curvature of an image-side lens surface of the air lens of the sixth lens group G6.

The conditional expression (18) defines the shape factor of the air lens provided in the sixth lens group G6. By satisfying the conditional expression (18), the field curves can be favorably corrected.

If the corresponding value of the conditional expression (18) falls below the lower limit value, it is difficult to correct the field curves. By setting the lower limit value of the conditional expression (18) to 0.01, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the lower limit value of the conditional expression (18) may be set to 0.10, 0.20, 0.28, 0.30, 0.40, and further to 0.45.

If the corresponding value of the conditional expression (18) exceeds the upper limit value, it is difficult to correct the field curves. By setting the upper limit value of the conditional expression (18) to 1.90, the advantageous effects of this embodiment can be more secured. To further secure the advantageous effects of this embodiment, the upper limit value of the conditional expression (18) may be set to 1.70, 1.50, 1.20, and further to 1.00.

Preferably, the zoom optical system ZL according to this embodiment comprises, in order from the object: the first lens group G1 having the positive refractive power; the second lens group G2 having the negative refractive power; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5; and a sixth lens group G6, wherein upon zooming, at least the first lens group G1, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move with respect to the image surface. Accordingly, the variation in magnification of each lens group upon zooming can be increased. Furthermore, the aberrations occurring at the third lens group G3 upon zooming can be corrected by the fourth lens group G4.

Preferably, in the zoom optical system ZL according to this embodiment, the lens groups moving upon zooming move toward the object upon zooming from the wide angle end state to the telephoto end state. Accordingly, a sufficient zooming ratio satisfying the performance of this embodiment can be secured.

Subsequently, referring to FIG. 41, a method of manufacturing the zoom optical system ZL according to this embodiment is generally described. First, in order from the object, a first lens group G1 having a positive refractive power, and a second lens group G2 having a negative refractive power are arranged (step ST1). It is configured such that the distance between the adjacent lens groups change upon zooming (step ST2). An aperture stop is arranged closer to the image than the second lens group G2 (step ST3). Furthermore, each lens is arranged in a lens barrel so as to satisfy at least the conditional expression (1) described above (step ST4). According to such a manufacturing method, the zoom optical system that has a high zooming ratio and a favorable optical performance can be manufactured.

EXAMPLES

Hereinafter, zoom optical systems ZL according to examples of this embodiment will be described with reference to the drawings. FIGS. 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34 and 37 are sectional views showing configurations and refractive power distributions of the zoom optical systems ZL {ZL(1) to ZL(13)} according to first to thirteenth examples. In each diagram, the movement direction along the optical axis of each lens group that moves upon zooming from the wide angle end state to the telephoto end state is indicated by an arrow. Furthermore, the movement direction of a focusing group upon focusing from the infinity to a short distant object is indicated by an arrow accompanied by characters “FOCUSING”. At least a part of the third lens group G3 is assumed as a vibration-proof group. The movement direction upon image blur correction is indicated by an arrow accompanied by characters “VIBRATION-PROOF”.

In these drawings (FIGS. 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34 and 37), each lens group is represented by a combination of a symbol G and a numeral, and each lens is represented by a combination of a symbol L and a numeral. In this case, to prevent the number of types and the numbers of symbols and numerals from being large and complicated, the lens groups and the like are represented using combinations of symbols and numerals independently among the examples. Accordingly, even though the same combinations of symbols and numerals are used among the examples, such usage does not mean the same configuration.

Tables 1 to 13 are hereinafter shown. Among them, Table 1 is a table showing each data item in the first example, Table 2 is that in the second example, Table 3 is that in the third example, Table 4 is that in the fourth example, Table 5 is that in the fifth example, Table 6 is that in the sixth example, Table 7 is that in the seventh example, Table 8 is that in the eighth example, Table 9 is that in the ninth example, Table 10 is that in the tenth example, Table 11 is that in the eleventh example, Table 12 is that in the twelfth example, and Table 13 is that in the thirteenth example. In each example, d-line (wavelength λ=587.6 nm), and g-line (wavelength λ=435.8 nm) are selected as calculation targets of aberration characteristics.

In tables of [General data], FNO indicates the F-number, ω indicates the half angle of view (the unit is ° (degrees)), and Y indicates the image height. TL indicates a distance obtained by adding BF to the distance from the lens foremost surface to the lens last surface on the optical axis upon focusing on infinity. BF indicates the air equivalent distance (back focus) from the lens last surface to the image surface I on the optical axis upon focusing on infinity. Note that these values are indicated for zoom states at the wide-angle end (W), a first intermediate focal length (M1), a second intermediate focal length (M2), and the telephoto end (T). In the tables of [General data], f3b indicates the focal length of the vibration-proof group. f3c indicates the focal length of the 3c group. βT3r indicates the magnification of the lens groups consisting of lenses disposed closer to the image than the vibration-proof group in the telephoto end state. βT3b indicates the magnification of the vibration-proof group in the telephoto end state. f123w indicates the combined focal length of the first lens group G1, the second lens group G2 and the third lens group G3 in the wide angle end state. f123t indicates the combined focal length of the first lens group G1, the second lens group G2 and the third lens group G3 in the telephoto end state.

In the table of [Lens data], Surface number indicates the order of the optical surface from the object side along the direction in which the ray travels, R indicates the radius of curvature (the surface whose center of curvature resides on the image side is regarded to have a positive value) of each optical surface, D indicates the surface distance from each optical surface to the next optical surface (or the image surface) on the optical axis, nd is the refractive index of the material of the optical member for d-line, and νd indicates the Abbe number of the material of the optical member with reference to d-line. The radius of curvature “00” indicates a plane or an aperture, and (Aperture stop S) indicates an aperture stop. The description of the air refractive index nd=1.00000 is omitted. In a case where the lens surface is an aspherical surface, the surface number is assigned * symbol, and the field of the radius of curvature R indicates the paraxial radius of curvature.

In the table of [Aspherical surface data], the shape of the aspherical surface indicated in [Lens data] is indicated by the following expression (A). X(y) indicates the distance (sag amount) from the tangent plane at the vertex of the aspherical surface to the position on the aspherical surface at the height y along the optical axis direction. R indicates the radius of curvature (paraxial radius of curvature) of the reference spherical surface. κ indicates the conic constant. Ai indicates the i-order aspherical coefficient. “E-n” indicates “×10^(−n)”. For example, 1.234E-05=1.234×10⁻⁵. Note that the second-order aspherical coefficient A2 is zero, and its description is omitted.

X(y)=(y ² /R)/{1+(1−κxy ² /R ²)^(1/2) }+A4xy ⁴ +A6xy ⁶ +A8xy ⁸ +A10xy ¹⁰ +A12xy ¹²  (A)

The table of [Lens group data] shows the first surface (the surface closest to the object) and the focal length of each lens group.

The table of [Variable distance data] shows the surface distances at surface numbers where the surface distance is “Variable” in the table showing [Lens data]. Here, surface distances in the zoom states at the wide-angle end (W), the first intermediate focal length (M1), the second intermediate focal length (M2) and the telephoto end (T) upon the infinity focus and the short range focus are indicated. In [Variable distance data], f indicates the focal length of the entire lens system, and β indicates the photographing magnification.

The table of [Conditional expression corresponding value] shows the value corresponding to each conditional expression.

Hereinafter, among all the data values, “mm” is generally used for the listed focal length f, radius of curvature R, surface distance D, other lengths and the like if not otherwise specified. However, there is no limitation thereto, because the optical system can achieve equivalent optical performances even if being proportionally enlarged or reduced.

The description of the table so far is common to all the examples. Hereinafter, redundant description is omitted.

First Example

A first example is described with reference to FIGS. 1 to 3A and 3B and Table 1. FIG. 1 is a lens configuration diagram of a zoom optical system according to the first example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(1) according to the first example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a negative refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in the directions indicated by arrows in FIG. 1 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move. The sign (+) or (−) assigned to each lens group symbol indicates the refractive power of the corresponding lens group. This similarly applies to all the following examples.

The first lens group G1 consists of, in order from the object: a negative meniscus lens L11 having a convex surface facing the object; a biconvex positive lens L12; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a biconcave negative lens L22; a biconvex positive lens L23; and a biconcave negative lens L24.

The third lens group G3 consists of, in order from the object: a biconvex positive lens L31; a cemented lens composed of a negative meniscus lens L32 having a convex surface facing the object and a biconvex positive lens L33; and a negative meniscus lens L34 having a concave surface facing the object.

The fourth lens group G4 consists of, in order from the object: a cemented lens composed of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object; and a cemented lens composed of a negative meniscus lens L43 having a convex surface facing the object and a biconvex positive lens L44. The image side surface of the positive lens L44 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a biconvex positive lens L51 and a biconcave negative lens L52. The image side surface of the negative lens L52 is of aspherical shape.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a biconvex positive lens L62. An air lens is formed between the negative meniscus lens L61 and the positive lens L62. The image side surface of the negative meniscus lens L61 is of aspherical shape. The image surface I is disposed on the image side of the sixth lens group G6.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I). Note that the positive lens L31 in the third lens group G3 corresponds to the 3a group. The cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 corresponds to the 3b group. The negative meniscus lens L34 in the third lens group G3 corresponds to the 3c group.

The following Table 1 lists values of data on the zoom optical system according to the first example.

TABLE 1 [General Data] Zooming ratio 7.848 f3b = 67.50733 f3c = −42.57709 βT3r = 1.53564 βT3b = 0.0216 f123w = −217.63848 f123t = −267.32298 W M1 M2 T FNO 4.12109 5.58779 6.39998 6.50002 ω 42.58698 22.66696 11.13686 6.13014 Y 20.50 21.70 21.70 21.70 TL 126.45486 144.98844 168.50373 188.4741 [Lens Data] Surface Number R D νd nd  1 185.7354 2.0000 31.27 1.903660  2 75.9813 1.0263  3 81.5981 6.4204 67.90 1.593190  4 −494.4016 0.1000  5 59.1320 6.1300 67.90 1.593190  6 390.1369 D1(Variable)  7 236.0277 1.2500 32.33 1.953750  8 19.0394 5.0675  9 −46.6700 1.1000 52.33 1.755000 10 68.1612 0.4169 11 37.1210 3.3840 20.88 1.922860 12 −52.5580 0.5124 13 −32.9357 1.0000 46.59 1.816000 14 416.8076 D2(Variable) 15 ∞ 2.0000 (Aperture Stop S) 16 39.8204 2.5136 35.72 1.902650 17 −292.5261 0.5000 18 36.7161 1.0000 29.12 2.001000 19 20.9452 3.3404 53.74 1.579570 20 −76.0620 1.4447 21 −35.5626 1.0000 32.33 1.953750 22 −290.1606 D3(Variable) 23 37.1374 4.6344 42.73 1.834810 24 −37.1374 1.0000 31.27 1.903660 25 −308.9768 0.1000 26 31.6449 2.7756 32.33 1.953750 27 15.2741 8.7030 81.49 1.497100 28* −40.3095 D4(Variable) 29 1365.4927 3.0634 23.80 1.846660 30 −35.3251 1.0000 40.13 1.851350 31* 32.6144 D5(Variable) 32 −16.9998 1.4000 42.51 1.820800 33* −22.5398 0.1000 34 626.7496 3.5530 37.57 1.683760 35 −77.6296 BF [Aspherical Surface Data] 28th Surface κ = 1.0000, A4 = 3.13017E−05, A6 = −1.03090E−07 A8 = 6.53525E−10, A10 = −2.57830E−12, A12 = 0.32673E−14 31st Surface κ = 1.0000, A4 = −6.66636E−06, A6 = 5.10546E−08 A8 = 1.72567E−11, A10 = −2.40595E−12, A12 = 0.98445E−14 33rd Surface κ = 1.0000, A4 = −1.93366E−06, A6 = −2.05750E−08 A8 = 8.81224E−11, A10 = −2.94021E−13, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 98.9899 G2 7 −16.5057 G3 16 48.48369 G4 23 28.91747 G5 29 −39.0895 G6 32 −15588.34 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.72001 49.99999 105.05133 193.99063 D0 ∞ ∞ ∞ ∞ D1 1.50000 17.29645 38.92328 54.52847 D2 18.83905 10.91446 4.55495 1.10018 D3 12.23175 6.39417 3.18615 1.47844 D4 5.54311 4.42699 5.70823 2.00068 D5 10.05055 17.00460 18.93085 24.34574 BF 11.75486 22.41624 30.66474 38.48515 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06221 −0.11053 −0.17918 −0.28386 D0 365.9340 397.4004 473.8851 503.9147 D1 1.50000 17.29645 38.92328 54.52847 D2 18.83905 10.91446 4.55495 1.10018 D3 12.23175 6.39417 3.18615 1.47844 D4 6.43705 6.05192 10.02051 11.69839 D5 9.15661 15.37967 14.61857 14.64803 BF 11.78171 22.50112 30.88824 39.04500 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.739 Conditional Expression(2) TLw/fw = 5.115 Conditional Expression(3) Mv4/Mv3 = 1.402 Conditional Expression(4) Mv2/fw = 0.364 Conditional Expression(5) f3b/f3 = 1.392 Conditional Expression(6) βT3r × (1 − βT3b) = 1.502 Conditional Expression(7) (−f3c)/f3b = 0.631 Conditional Expression(8) (R3c2 + R3c1)/(R3c2 − R3c1) = 1.279 Conditional Expression(9) ft/fw = 7.848 Conditional Expression(10) ωw = 42.587 Conditional Expression(11) ωt = 6.130 Conditional Expression(12) fw/f123w = −0.114 Conditional Expression(13) ft/f123t = −0.726 Conditional Expression(14) BFw/fw = 0.476 Conditional Expression(15) (−f5)/fw = 1.581 Conditional Expression(16) Mv5/Mv6 = 1.535 Conditional Expression(17) Mv1/(ft − fw) = 0.366 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = 0.931

FIGS. 2A and 2B are various aberration graphs of the zoom optical system according to the first example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 3A and 3B are coma aberration graphs of the zoom optical system according to the first example in the wide-angle end state and the telephoto end state when blur correction is performed. In the aberration graphs in FIGS. 2A and 2B, FNO indicates the F-number, and Y indicates the image height. The spherical aberration graph indicates the value of the F-number corresponding to the maximum diameter. The astigmatism graph and the distortion graph each indicate the maximum value of the image height. The coma aberration graph indicates the value of each image height. The coma aberration graphs in FIGS. 3A and 3B indicate the value of each image height. In each aberration graph, d indicates d-line (wavelength λ=587.6 nm), and g indicates g-line (wavelength λ=435.8 nm). In the astigmatism graph, a solid line indicates a sagittal image surface, and a broken line indicates a meridional image surface. Note that also in the aberration graph in each example described below, symbols similar to those in this example are used, and redundant description is omitted.

The various aberration graphs show that the zoom optical system according to the first example favorably corrects the various aberrations, and has an excellent imaging performance.

Second Example

A second example is described with reference to FIGS. 4 to 6A and 6B and Table 2. FIG. 4 is a lens configuration diagram of a zoom optical system according to the second example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(2) according to the second example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; a third lens group G3 that has a positive refractive power and is provided with an aperture stop S; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a negative refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the third lens group G3 provided with the aperture stop S, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in the directions indicated by arrows in FIG. 4 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move.

The first lens group G1 consists of, in order from the object: a negative meniscus lens L11 having a convex surface facing the object; a biconvex positive lens L12; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a biconcave negative lens L22; a biconvex positive lens L23; and a negative meniscus lens L24 having a concave surface facing the object.

The third lens group G3 consists of, in order from the object: a biconvex positive lens L31; an aperture stop S; a cemented lens composed of a negative meniscus lens L32 having a convex surface facing the object and a biconvex positive lens L33; and a negative meniscus lens L34 having a concave surface facing the object.

The fourth lens group G4 consists of, in order from the object: a cemented lens composed of a biconvex positive lens L41, and a negative meniscus lens L42 having a concave surface facing the object; and a cemented lens composed of a negative meniscus lens L43 having a convex surface facing the object and a biconvex positive lens L44. The image side surface of the positive lens L44 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a biconvex positive lens L51 and a biconcave negative lens L52. The image side surface of the negative lens L52 is of aspherical shape.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a biconvex positive lens L62. An air lens is formed between the negative meniscus lens L61 and the positive lens L62. The image side surface of the negative meniscus lens L61 is of aspherical shape. The image surface I is disposed on the image side of the sixth lens group G6.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I). Note that the positive lens L31 in the third lens group G3 corresponds to the 3a group. The cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 corresponds to the 3b group. The negative meniscus lens L34 in the third lens group G3 corresponds to the 3c group.

The following Table 2 lists values of data on the zoom optical system according to the second example.

TABLE 2 [General Data] Zooming ratio 7.848 f3b = 68.43168 f3c = −46.58563 βT3r = 1.448 βT3b = −0.04414 f123w = −377.733 f123t = −288.19144 W M1 M2 T FNO 4.12000 5.60000 6.20000 6.49999 ω 43.04718 22.53540 10.65017 6.13829 Y 20.91 21.70 21.70 21.70 TL 125.95528 142.51715 167.85323 186.8435 [Lens Data] Surface Number R D νd nd  1 188.64525 2.00000 31.27 1.903660  2 77.80524 0.84780  3 80.41425 6.51915 67.90 1.593190  4 −471.30377 0.10000  5 62.30684 5.66572 67.90 1.593190  6 358.24871 D1(Variable)  7 230.01286 1.25000 43.79 1.848500  8 18.45421 5.50336  9 −40.33983 1.10000 52.34 1.755000 10 79.65336 0.38546 11 39.14822 3.37749 23.80 1.846660 12 −47.38891 0.46523 13 −31.94449 1.00000 46.59 1.816000 14 −2729.77760 D2(Variable) 15 41.64137 2.51154 35.73 1.902650 16 −289.39118 0.40000 17 ∞ 0.10000 (Aperture Stop S) 18 38.12143 1.00000 29.12 2.001000 19 21.49924 3.26023 53.74 1.579570 20 −73.20919 1.47119 21 −34.94662 1.00000 32.33 1.953750 22 −165.99888 D3(Variable) 23 37.20805 4.18411 42.73 1.834810 24 −43.17368 1.00003 31.27 1.903660 25 −659.56023 1.54931 26 28.71779 1.32801 32.33 1.953750 27 14.76801 9.10325 81.49 1.497100 28* −42.86465 D4 (Variable) 29 255.99237 3.36761 23.80 1.846660 30 −33.68693 1.00000 40.13 1.851350 31* 31.06431 D5(Variable) 32 −23.57856 1.40000 45.21 1.794457 33* −50.21699 0.10000 34 91.45040 3.78568 29.84 1.800000 35 −197.78095 BF [Aspherical Surface Data] 28th Surface K = 1.0000, A4 = 2.56920E−05, A6 = −9.38399E−08 A8 = 4.71077E−10, A10 = −1.70196E−12, A12 = 0.00000E+00 31st Surface K = 1.0000, A4 = −6.78111E−06, A6 = 6.47335E−08 A8 = −3.28125E−10, A10 = 2.56418E−13, A12 = 0.00000E+00 33rd Surface K = 1.0000, A4 = 3.30419E−06, A6 = −1.76274E−09 A8 = 1.66657E−12, A10 = 1.80471E−14, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 102.16195 G2 7 −16.76640 G3 15 47.83089 G4 23 29.71748 G5 29 −41.62356 G6 32 −236.16863 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.72031 50.00094 110.00281 194.00483 D0 ∞ ∞ ∞ ∞ D1 1.50000 17.23398 38.86323 55.71214 D2 19.13452 10.77832 3.90279 1.10000 D3 12.16022 5.90688 2.59619 1.47832 D4 5.12094 4.32200 5.90770 2.00000 D5 10.00915 17.06861 18.78383 23.80987 BF 11.25528 20.43218 31.02431 35.96804 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06086 −0.10794 −0.18504 −0.27368 D0 374.0451 407.4838 482.1484 513.1582 D1 1.50000 17.23398 38.86323 55.71214 D2 19.13452 10.77832 3.90279 1.10000 D3 12.16022 5.90688 2.59619 1.47832 D4 6.06949 6.02341 10.42761 11.59738 D5 9.06059 15.36720 14.26392 14.21249 BF 11.25529 20.4322 31.02445 35.96847 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.849 Conditional Expression(2) TLw/fw = 5.095 Conditional Expression(3) Mv4/Mv3 = 1.432 Conditional Expression(4) Mv2/fw = 0.270 Conditional Expression(5) f3b/f3 = 1.431 Conditional Expression(6) βT3r × (1 − βT3b) = 1.872 Conditional Expression(7) (−f3c)/f3b = 0.681 Conditional Expression(8) (R3c2 + R3c1)/(R3c2 − R3c1) = 1.533 Conditional Expression(9) ft/fw = 7.848 Conditional Expression(10) ωw = 43.047 Conditional Expression(11) ωt = 6.138 Conditional Expression(12) fw/f123w = −0.112 Conditional Expression(13) ft/f123t = −0.783 Conditional Expression(14) BFw/fw = 0.455 Conditional Expression(15) (−f5)/fw = 1.684 Conditional Expression(16) Mv5/Mv6 = 1.558 Conditional Expression(17) Mv1/(ft − fw) = 0.360 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = 0.291

FIGS. 5A and 5B are various aberration graphs of the zoom optical system according to the second example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 6A and 6B are coma aberration graphs of the zoom optical system according to the second example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the second example favorably corrects the various aberrations, and has an excellent imaging performance.

Third Example

A third example is described with reference to FIGS. 7 to 9A and 9B and Table 3. FIG. 7 is a lens configuration diagram of a zoom optical system according to the third example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(3) according to the third example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a negative refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in the directions indicated by arrows in FIG. 7 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move.

The first lens group G1 consists of, in order from the object: a cemented lens composed of a negative meniscus lens L11 having a convex surface facing the object and a biconvex positive lens L12; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a negative meniscus lens L22 having a convex surface facing the object; a positive meniscus lens L23 having a convex surface facing the object; and a cemented lens composed of a positive meniscus lens L24 having a concave surface facing the object and a negative meniscus lens L25 having a concave surface facing the object. The image side surface of the negative meniscus lens L21 is of aspherical shape. The image side surface of the negative meniscus lens L25 is of aspherical shape.

The third lens group G3 consists of a positive meniscus lens L31 having a convex surface facing the object. The image side surface of the positive meniscus lens L31 is of aspherical shape.

The fourth lens group G4 consists of, in order from the object: a biconvex positive lens L41; a cemented lens composed of a negative meniscus lens L42 having a convex surface facing the object and a positive meniscus lens L43 having a convex surface facing the object; and a cemented lens composed of a biconvex positive lens L44 and a negative meniscus lens L45 having a concave surface facing the object. The image side surface of the negative meniscus lens L45 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a positive meniscus lens L51 having a concave surface facing the object and a biconcave negative lens L52. The image side surface of the negative lens L52 is of aspherical shape.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a positive meniscus lens L62 having a concave surface facing the object. An air lens is formed between the negative meniscus lens L61 and the positive meniscus lens L62. The image surface I is disposed on the image side of the sixth lens group G6.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the positive meniscus lens L31 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I).

The following Table 3 lists values of data on the zoom optical system according to the third example.

TABLE 3 [General Data] Zooming ratio 7.850 f3b = 52.10796 βT3r = −0.65234 βT3b = 4.071466 f123w = −526.69259 f123t = −297.45559 W M1 M2 T FNO 4.12000 5.00001 6.14000 6.50003 ω 41.94830 22.05780 10.36801 5.96172 Y 21.34 21.70 21.70 21.70 TL 118.25612 134.48400 163.70742 182.4804 [Lens Data] Surface Number R D νd nd  1 151.3952 2.0000 23.80 1.846660  2 87.2806 5.9280 67.90 1.593190  3 −1349.8590 0.1000  4 76.7487 4.4238 67.90 1.593190  5 320.3570 D1(Variable)  6* 395.1403 1.2500 40.66 1.883000  7 17.9444 4.0881  8 172.0131 1.0000 27.15 1.944421  9 41.2622 0.6317 10 28.0910 3.7608 20.88 1.922860 11 282.0417 1.6588 12 −43.9082 1.6452 25.64 1.784720 13 −19.4929 1.1000 43.36 1.839318 14* −367.3130 D2(Variable) 15 ∞ 1.8230 (Aperture Stop S) 16* 25.2025 2.7754 59.33 1.609605 17 116.8971 D3(Variable) 18 27.7315 3.2255 67.90 1.593190 19 −829.3049 0.7234 20 31.9256 2.0849 32.32 1.953747 21 14.4283 4.6386 70.32 1.487490 22 87.2035 0.7730 23 61.3969 5.2420 82.57 1.497820 24 −18.0219 4.1197 37.22 1.882023 25* −25.6911 D4(Variable) 26 −1678.9249 3.0141 25.26 1.902000 27 −33.6869 1.0000 40.12 1.851080 28* 40.9152 D5(Variable) 29 −15.4450 1.2500 46.59 1.816000 30 −29.1017 0.1000 31 −162.7939 2.9649 29.37 1.950000 32 −61.0034 BF [Aspherical Surface Data] 6th Surface K = 1.9193, A4 = 5.26888E−06, A6 = −1.61582E−08 A8 = 5.37910E−11, A10 = −9.15512E−14, A12 = 0.00000E+00 14th Surface K = 6.0000, A4 = 8.64764E−07, A6 = −1.04249E−08 A8 = −8.45595E−12, A10 = 4.36832E−13, A12 = 0.00000E+00 16th Surface K = −0.0411, A4 = −5.82687E−06, A6 = 1.89727E−08 A8 = −3.04157E−10, A10 = 1.94188E−12, A12 = 0.00000E+00 25th Surface K = 1.0633, A4 = 1.55522E−05, A6 = −4.60661E−08 A8 = 2.01166E−10, A10 = −8.69226E−13, A12 = 0.00000E+00 28th Surface K = 0.0000, A4 = −8.62706E−06, A6 = 9.53672E−08 A8 = −5.21848E−10, A10 = 1.74761E−12, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 111.43064 G2 6 −17.83112 G3 16 52.10796 G4 18 30.96133 G5 26 −50.42308 G6 29 −77.20586 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.72028 50.00010 110.02145 194.04302 D0 ∞ ∞ ∞ ∞ D1 1.56355 16.96393 42.92481 58.95782 D2 18.90672 9.77960 3.82294 0.50000 D3 10.22026 5.92276 2.94135 1.20000 D4 6.49920 5.70254 5.42574 2.50000 D5 10.45535 15.54950 18.80771 23.47480 BF 9.29011 19.24474 28.46394 34.52694 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06124 −0.12203 −0.24452 −0.38142 D0 373.1327 356.9049 327.6814 308.9084 D1 1.56355 16.96393 42.92481 58.95782 D2 18.90672 9.77960 3.82294 0.50000 D3 10.22026 5.92276 2.94135 1.20000 D4 7.63429 7.89257 11.92314 16.79614 D5 9.32026 13.35947 12.31031 9.17866 BF 9.31670 19.34984 28.88441 35.54307 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.789 Conditional Expression(2) TLw/fw = 4.784 Conditional Expression(3) Mv4/Mv3 = 1.357 Conditional Expression(4) Mv2/fw = 0.276 Conditional Expression(5) f3b/f3 = 1.000 Conditional Expression(6) βT3r × (1 − βT3b) = 2.004 Conditional Expression(9) ft/fw = 7.850 Conditional Expression(10) ωw = 41.948 Conditional Expression(11) ωt = 5.962 Conditional Expression(12) fw/f123w = −0.047 Conditional Expression(13) ft/f123t = −0.652 Conditional Expression(14) BFw/fw = 0.376 Conditional Expression(15) (−f5)/fw = 2.040 Conditional Expression(16) Mv5/Mv6 = 1.516 Conditional Expression(17) Mv1/(ft − fw) = 0.379 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = 1.435

FIGS. 8A and 8B are various aberration graphs of the zoom optical system according to the third example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 9A and 9B are coma aberration graphs of the zoom optical system according to the third example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the third example favorably corrects the various aberrations, and has an excellent imaging performance.

Fourth Example

A fourth example is described with reference to FIGS. 10 to 12A and 12B and Table 4. FIG. 10 is a lens configuration diagram of a zoom optical system according to the fourth example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(4) according to the fourth example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a negative refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in directions indicated by arrows in FIG. 10 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move.

The first lens group G1 consists of, in order from the object: a cemented lens composed of a negative meniscus lens L11 having a convex surface facing the object and a biconvex positive lens L12; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a negative meniscus lens L22 having a convex surface facing the object; a biconvex positive lens L23; a cemented lens composed of a positive meniscus lens L24 having a concave surface facing the object and a negative meniscus lens L25 having a concave surface facing the object. The object side surface of the negative meniscus lens L21 is of aspherical shape. The image side surface of the negative meniscus lens L25 is of aspherical shape.

The third lens group G3 consists of, in order from the object: a positive meniscus lens L31 having a convex surface facing the object; and a cemented lens composed of a biconvex positive lens L32 and a negative meniscus lens L33 having a concave surface facing the object. The image side surface of the positive meniscus lens L31 is of aspherical shape.

The fourth lens group G4 consists of, in order from the object: a positive meniscus lens L41 having a convex surface facing the object; a cemented lens composed of a negative meniscus lens L42 having a convex surface facing the object and a positive meniscus lens L43 having a convex surface facing the object; and a cemented lens composed of a positive meniscus lens L44 having a concave surface facing the object and a negative meniscus lens L45 having a concave surface facing the object. The image side surface of the negative meniscus lens L45 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a biconvex positive lens L51 and a biconcave negative lens L52. The image side surface of the negative lens L52 is of aspherical shape.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a plano-convex positive lens L62 having a plane facing the image surface I. An air lens is formed between the negative meniscus lens L61 and the positive lens L62. The image surface I is disposed on the image side of the sixth lens group G6.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the cemented lens composed of the positive lens L32 and the negative meniscus lens L33 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I).

The following Table 4 lists values of data on the zoom optical system according to the fourth example.

TABLE 4 [General Data] Zooming ratio 7.848 f3b = 82.45567 βT3r = −0.12637 βT3b = 12.58061 f123w = 102.18699 f123t = −1535.17561 W M1 M2 T FNO 4.12000 5.00001 6.14000 6.50003 ω 41.94830 22.05780 10.36801 5.96172 Y 21.65 21.70 21.70 21.70 TL 122.11284 138.25648 173.12226 195.4602 [Lens Data] Surface Number R D νd nd  1 157.9423 2.0000 23.80 1.846660  2 81.8879 5.9036 67.90 1.593190  3 −2013.3747 0.1000  4 63.5017 4.6636 63.34 1.618000  5 210.8809 D1(Variable)  6* 318.1018 1.2500 40.66 1.883000  7 16.7008 4.7201  8 704.9777 1.3500 25.79 1.940573  9 35.9277 0.1354 10 25.6246 4.3288 20.88 1.922860 11 −84.8316 1.1878 12 −26.8353 2.5514 26.72 1.759928 13 −14.0619 1.1000 40.66 1.883000 14* −120.1155 D2(Variable) 15 ∞ 1.7168 (Aperture Stop S) 16* 25.0707 2.5492 56.42 1.650119 17 50.5707 1.8201 18 2141.2793 3.9646 47.10 1.718816 19 −19.4561 1.2000 29.37 1.950000 20 −40.3974 D3(Variable) 21 33.1155 2.7430 58.12 1.622989 22 102.1338 0.1000 23 26.3197 4.3495 29.37 1.950000 24 14.1783 4.4212 70.32 1.487490 25 72.5822 1.6811 26 −306.2709 4.3812 82.57 1.497820 27 −18.7373 1.2500 37.22 1.882023 28* −24.4766 D4 (Variable) 29 119.2349 3.5589 25.92 1.805628 30 −33.6869 1.0000 40.12 1.851080 31* 32.8619 D5 (Variable) 32 −22.4629 1.2500 40.66 1.883000 33 −43.8572 0.1000 34 61.5070 4.1976 33.02 1.689260 35 ∞ BF [Aspherical Surface Data] 6th Surface K = 6.0000, A4 = 9.24936E−06, A6 = 4.48621E−09 A8 = −4.48203E−11, A10 = 1.65001E−13, A12 = 0.00000E+00 14th Surface K = 5.8635, A4 = −1.80704E−06, A6 = 1.46957E−08 A8 = −7.35664E−11, A10 = −5.50824E−13, A12 = 0.00000E+00 16th Surface K = 0.0729, A4 = −4.52720E−06, A6 = 2.52623E−08 A8 = −1.11420E−10, A10 = 1.41519E−13, A12 = 0.00000E+00 28th Surface K = 1.0568, A4 = 1.62692E−05, A6 = −9.59061E−09 A8 = −6.35322E−11, A10 = 1.73247E−13, A12 = 0.00000E+00 31st Surface K = 1.0365, A4 = −5.49985E−06, A6 = 5.29125E−08 A8 = −9.39998E−11, A10 = 1.17057E−13, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 106.62052 G2 6 −16.22739 G3 16 41.04090 G4 21 40.60874 G5 29 −49.86905 G6 32 −140.23760 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.71999 49.99999 109.99995 193.99988 D0 ∞ ∞ ∞ ∞ D1 1.50000 18.53350 35.68354 55.45436 D2 17.47125 8.41504 3.49296 0.78316 D3 8.24386 2.43196 1.40000 1.44036 D4 6.00186 7.14502 5.60349 2.49999 D5 10.03309 14.70182 17.27531 20.33845 BF 9.28884 17.45519 40.09303 45.36996 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06195 −0.10885 −0.20280 −0.28444 D0 369.2759 403.0933 448.2665 495.9287 D1 1.50000 18.53350 35.68354 55.45436 D2 17.47125 8.41504 3.49296 0.78316 D3 8.24386 2.43196 1.40000 1.44036 D4 7.29302 9.64626 10.19294 12.30143 D5 8.74193 12.20058 12.68586 10.53701 BF 9.31603 17.53910 40.38407 45.94189 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.748 Conditional Expression(2) TLw/fw = 4.940 Conditional Expression(3) Mv4/Mv3 = 1.189 Conditional Expression(4) Mv2/fw = 0.785 Conditional Expression(5) f3b/f3 = 2.009 Conditional Expression(6) βT3r × (1 − βT3b) = 1.463 Conditional Expression(9) ft/fw = 7.848 Conditional Expression(10) ωw = 41.948 Conditional Expression(11) ωt = 5.962 Conditional Expression(12) fw/f123w = 0.242 Conditional Expression(13) ft/f123t = −0.126 Conditional Expression(14) BFw/fw = 0.376 Conditional Expression(15) (−f5)/fw = 2.017 Conditional Expression(16) Mv5/Mv6 = 1.286 Conditional Expression(17) Mv1/(ft − fw) = 0.433 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = 0.168

FIGS. 11A and 11B are various aberration graphs of the zoom optical system according to the fourth example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 12A and 12B are coma aberration graphs of the zoom optical system according to the fourth example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the fourth example favorably corrects the various aberrations, and has an excellent imaging performance.

Fifth Example

A fifth example is described with reference to FIGS. 13 to 15A and 15B and Table 5. FIG. 13 is a lens configuration diagram of a zoom optical system according to the fifth example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(5) according to the fifth example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a positive refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in directions indicated by arrows in FIG. 13 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move.

The first lens group G1 consists of, in order from the object: a cemented lens composed of a negative meniscus lens L11 having a convex surface facing the object and a biconvex positive lens L12; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a biconcave negative lens L22; a biconvex positive lens L23; and a negative meniscus lens L24 having a concave surface facing the object. The object side surface of the negative meniscus lens L21 is of aspherical shape. The image side surface of the negative meniscus lens L24 is of aspherical shape.

The third lens group G3 consists of, in order from the object: a positive meniscus lens L31 having a convex surface facing the object; and a cemented lens composed of a negative meniscus lens L32 having a convex surface facing the object and a biconvex positive lens L33. The image side surface of the positive meniscus lens L31 is of aspherical shape.

The fourth lens group G4 consists of, in order from the object: a positive meniscus lens L41 having a convex surface facing the object; a cemented lens composed of a negative meniscus lens L42 having a convex surface facing the object and a biconvex positive lens L43; and a cemented lens composed of a biconvex positive lens L44 and a biconcave negative lens L45. The image side surface of the negative lens L45 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a biconvex positive lens L51 and a biconcave negative lens L52. The image side surface of the negative lens L52 is of aspherical shape.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a biconvex positive lens L62. An air lens is formed between the negative meniscus lens L61 and the positive lens L62. The image surface I is disposed on the image side of the sixth lens group G6.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I).

The following Table 5 lists values of data on the zoom optical system according to the fifth example.

TABLE 5 [General Data] Zooming ratio 7.848 f3b = 106.68603 βT3r = −0.22522 βT3b = 5.55377 f123w = 148.33142 f123t = −861.38789 W M1 M2 T FNO 4.12000 5.60000 6.20000 6.49999 ω 42.61146 22.53540 10.65017 6.13829 Y 20.68 21.70 21.70 21.70 TL 122.11284 137.15660 162.89036 188.0553 [Lens Data] Surface Number R D νd nd  1 120.0314 2.0000 23.80 1.846660  2 75.2829 6.2421 82.57 1.497820  3 −2364.7242 0.1000  4 64.4734 5.0111 64.74 1.607834  5 308.6603 D1(Variable)  6* 221.2774 1.2500 40.66 1.883000  7 17.1630 5.2789  8 −38.7201 1.1000 33.32 1.903162  9 95.9763 0.1000 10 40.1060 4.3656 20.88 1.922860 11 −33.5026 0.9492 12 −22.3899 1.1000 40.67 1.882762 13* −102.6938 D2(Variable) 14 ∞ 0.8341 (Aperture Stop S) 15* 31.3299 2.7567 63.86 1.517039 16 394.2979 1.0000 17 76.9690 1.1000 25.78 1.906571 18 30.3656 2.9449 45.71 1.623046 19 −89.6818 D3(Variable) 20 23.7528 3.8095 41.66 1.659437 21 83.0826 2.6863 22 52.1032 1.8385 32.25 1.954620 23 15.4393 5.4045 70.32 1.487490 24 −39.4485 0.1000 25 37.0327 3.3978 67.89 1.593103 26 −838.1647 1.2500 43.15 1.810385 27* 82.5521 D4(Variable) 28 623.8813 3.1385 22.74 1.808090 29 −33.6869 1.0000 41.21 1.836497 30* 32.8807 D5(Variable) 31 −21.3174 1.2500 27.35 1.663819 32 −31.8044 0.1043 33 92.9303 3.5471 28.93 1.727721 34 −394.1540 BF [Aspherical Surface Data] 6th Surface K = 5.7341, A4 = 1.16802E−06, A6 = 2.03518E−09 A8 = 1.81447E−11, A10 = 8.58869E−14, A12 = 0.00000E+00 13th Surface K = 3.2914, A4 = −1.11111E−06, A6 = 1.49282E−09 A8 = −3.72110E−11, A10 = 6.45032E−13, A12 = 0.00000E+00 15th Surface K = 0.0277, A4 = −8.27654E−06, A6 = 1.77158E−08 A8 = −1.81439E−10, A10 = 1.08193E−12, A12 = 0.00000E+00 27th Surface K = 1.9922, A4 = 1.24262E−05, A6 = −1.46784E−08 A8 = 3.73707E−10, A10 = −2.02655E−12, A12 = 0.00000E+00 30th Surface K = 1.9072, A4 = −8.91746E−06, A6 = 3.65180E−08 A8 = −5.04265E−10, A10 = 1.78607E−12, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 99.41971 G2 6 −15.74038 G3 15 41.65192 G4 20 37.63548 G5 28 −40.12367 G6 31 7119.59107 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.71999 49.99997 109.99986 193.99963 D0 ∞ ∞ ∞ ∞ D1 1.50000 16.60455 37.99399 53.23975 D2 18.36307 10.15010 3.58234 1.66590 D3 13.02129 4.83611 1.75831 1.47831 D4 6.45265 6.28920 8.47335 2.50000 D5 9.82549 18.17413 19.06777 25.32113 BF 9.29124 17.44341 28.35549 40.19113 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06170 −0.10941 −0.19455 −0.28776 D0 370.3154 405.3261 459.3561 504.3260 D1 1.50000 16.60455 37.99399 53.23975 D2 18.36307 10.15010 3.58234 1.66590 D3 13.02129 4.83611 1.75831 1.47831 D4 7.54590 8.23070 14.07758 12.27653 D5 8.73225 16.23263 13.46354 15.54460 BF 9.31427 17.51651 28.58674 40.69673 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.723 Conditional Expression(2) TLw/fw = 4.940 Conditional Expression(3) Mv4/Mv3 = 1.374 Conditional Expression(4) Mv2/fw = 0.575 Conditional Expression(5) f3b/f3 = 2.561 Conditional Expression(6) βT3r × (1 − βT3b) = 1.026 Conditional Expression(9) ft/fw = 7.848 Conditional Expression(10) ωw = 42.611 Conditional Expression(11) ωt = 6.138 Conditional Expression(12) fw/f123w = 0.167 Conditional Expression(13) ft/f123t = −0.225 Conditional Expression(14) BFw/fw = 0.376 Conditional Expression(15) (−f5)/fw = 1.623 Conditional Expression(16) Mv5/Mv6 = 1.501 Conditional Expression(17) Mv1/(ft − fw) = 0.390 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = 0.490

FIGS. 14A and 14B are various aberration graphs of the zoom optical system according to the fifth example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 15A and 15B are coma aberration graphs of the zoom optical system according to the fifth example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the fifth example favorably corrects the various aberrations, and has an excellent imaging performance.

Sixth Example

A sixth example is described with reference to FIGS. 16 to 18A and 18B and Table 6. FIG. 16 is a lens configuration diagram of a zoom optical system according to the sixth example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(6) according to the sixth example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a positive refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in directions indicated by arrows in FIG. 16 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move.

The first lens group G1 consists of, in order from the object: a cemented lens composed of a negative meniscus lens L11 having a convex surface facing the object and a biconvex positive lens L12; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a biconcave negative lens L22; a biconvex positive lens L23; and a negative meniscus lens L24 having a concave surface facing the object. The image side surface of the negative meniscus lens L21 is of aspherical shape. The image side surface of the negative meniscus lens L24 is of aspherical shape.

The third lens group G3 consists of, in order from the object: a biconvex positive lens L31; a cemented lens composed of a negative meniscus lens L32 having a convex surface facing the object and a biconvex positive lens L33; and a negative meniscus lens L34 having a concave surface facing the object.

The fourth lens group G4 consists of, in order from the object: a biconvex positive lens L41; a cemented lens composed of a negative meniscus lens L42 having a convex surface facing the object and a biconvex positive lens L43; and a cemented lens composed of a positive meniscus lens L44 having a convex surface facing the object and a negative meniscus lens L45 having a concave surface facing the object. The image side surface of the positive lens L41 is of aspherical shape. The image side surface of the negative meniscus lens L45 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a biconvex positive lens L51 and a biconcave negative lens L52. The image side surface of the negative lens L52 is of aspherical shape.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a biconvex positive lens L62. An air lens is formed between the negative meniscus lens L61 and the positive lens L62. The image surface I is disposed on the image side of the sixth lens group G6.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I). Note that the positive lens L31 in the third lens group G3 corresponds to the 3a group. The cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 corresponds to the 3b group. The negative meniscus lens L34 in the third lens group G3 corresponds to the 3c group.

The following Table 6 lists values of data on the zoom optical system according to the sixth example.

TABLE 6 [General Data] Zooming ratio 7.848 f3b = 76.01421 f3c = −51.03209 βT3r = 1.06249 βT3b = −0.27605 f123w = −136.43292 f123t = −215.16315 W M1 M2 T FNO 4.12001 5.60001 6.20000 6.50003 ω 42.67959 22.59339 10.65052 6.14768 Y 20.58 21.70 21.70 21.70 TL 122.11285 136.30769 162.04178 189.3093 [Lens Data] Surface Number R D νd nd  1 152.2083 2.0000 23.80 1.846660  2 89.2068 6.1884 82.57 1.497820  3 −413.2934 0.1000  4 63.3220 4.8830 67.90 1.593190  5 253.0230 D1(Variable)  6* 137.9264 1.2500 40.66 1.882996  7 17.8991 4.7805  8 −47.3363 1.1000 36.88 1.897432  9 75.2485 0.1000 10 39.7397 4.1374 21.58 1.918850 11 −39.0575 0.7197 12 −24.5868 1.1000 47.49 1.802013 13* −591.6627 D2(Variable) 14 ∞ 0.7464 (Aperture Stop S) 15 46.9722 2.7552 48.04 1.768500 16 −93.2395 0.5000 17 51.8617 1.1000 29.95 1.987022 18 25.2907 2.9021 45.71 1.623046 19 −73.0708 1.4973 20 −29.7887 1.0273 35.73 1.902641 21 −85.6917 D3(Variable) 22* 28.7123 3.8190 45.24 1.768369 23 −400.5317 2.3100 24 68.0478 1.0008 32.32 1.953752 25 17.9627 5.9680 78.66 1.495797 26 −34.0844 0.1000 27 42.3850 3.2656 67.90 1.593190 28 754.0925 1.2500 44.96 1.790885 29* 73.7905 D4(Variable) 30 256.5317 3.3327 22.74 1.808090 31 −33.6869 1.0000 40.27 1.839964 32* 28.6240 D5(Variable) 33 −20.9675 1.2500 27.35 1.663819 34 −40.3074 0.1000 35 173.3096 4.5044 31.21 1.841022 36 −72.4610 BF [Aspherical Surface Data] 6th Surface K = 0.0442, A4 = −4.01520E−06, A6 = 2.02052E−08 A8 = −1.03759E−10, A10 = 3.37776E−13, A12 = 0.00000E+00 13th Surface K = 1.0000, A4 = −6.36415E−06, A6 = 2.72142E−08 A8 = −2.64695E−10, A10 = 8.53046E−13, A12 = 0.00000E+00 22nd Surface K = 1.0000, A4 = −4.72982E−06, A6 = 7.21651E−09 A8 = −1.20147E−10, A10 = 3.75555E−13, A12 = 0.00000E+00 29th Surface K = 1.0000, A4 = 1.53597E−05, A6 = −6.12529E−09 A8 = 2.59000E−10, A10 = −2.05818E−12, A12 = 0.00000E+00 32nd Surface K = 1.0000, A4 = −5.88848E−06, A6 = 4.28279E−08 A8 = −4.85291E−10, A10 = 2.28998E−12, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 101.19406 G2 6 −16.04849 G3 15 49.36913 G4 22 29.13636 G5 30 −37.13373 G6 33 424.58679 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.72000 50.00001 109.99999 194.00003 D0 ∞ ∞ ∞ ∞ D1 1.50000 15.59832 37.20427 54.26539 D2 17.63580 9.34111 2.87140 1.75361 D3 12.53679 5.46459 2.24074 1.47831 D4 6.27123 7.05298 10.12752 2.50000 D5 9.72366 16.01381 16.16341 24.55336 BF 9.65757 18.04908 28.64666 39.97093 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06163 −0.10967 −0.19523 −0.28795 D0 370.3333 405.5358 460.2499 503.0996 D1 1.50000 15.59832 37.20427 54.26539 D2 17.63580 9.34111 2.87140 1.75361 D3 12.53679 5.46459 2.24074 1.47831 D4 7.24735 8.97695 15.97733 12.28747 D5 8.74755 14.08984 10.31360 14.76589 BF 9.68397 18.12250 28.87954 40.47730 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.679 Conditional Expression(2) TLw/fw = 4.940 Conditional Expression(3) Mv4/Mv3 = 1.365 Conditional Expression(4) Mv2/fw = 0.584 Conditional Expression(5) f3b/f3 = 1.540 Conditional Expression(6) βT3r × (1 − βT3b) = 1.356 Conditional Expression(7) (−f3c)/f3b = 0.671 Conditional Expression(8) (R3c2 + R3c1)/(R3c2 − R3c1) = 2.066 Conditional Expression(9) ft/fw = 7.848 Conditional Expression(10) ωw = 42.680 Conditional Expression(11) ωt = 6.148 Conditional Expression(12) fw/f123w = −0.181 Conditional Expression(13) ft/f123t = −0.902 Conditional Expression(14) BFw/fw = 0.391 Conditional Expression(15) (−f5)/fw = 1.502 Conditional Expression(16) Mv5/Mv6 = 1.489 Conditional Expression(17) Mv1/(ft − fw) = 0.397 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = 0.623

FIGS. 17A and 17B are various aberration graphs of the zoom optical system according to the sixth example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 18A and 18B are coma aberration graphs of the zoom optical system according to the sixth example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the sixth example favorably corrects the various aberrations, and has an excellent imaging performance.

Seventh Example

A seventh example is described with reference to FIGS. 19 to 21A and 21B and Table 7. FIG. 19 is a lens configuration diagram of a zoom optical system according to the seventh example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(7) according to the seventh example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a negative refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in directions indicated by arrows in FIG. 19 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move.

The first lens group G1 consists of, in order from the object: a cemented lens composed of a negative meniscus lens L11 having a convex surface facing the object and a biconvex positive lens L12; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a biconcave negative lens L22; a biconvex positive lens L23; and a negative meniscus lens L24 having a concave surface facing the object. The image side surface of the negative meniscus lens L21 is of aspherical shape. The image side surface of the negative meniscus lens L24 is of aspherical shape.

The third lens group G3 consists of, in order from the object: a positive meniscus lens L31 having a convex surface facing the object; a cemented lens composed of a negative meniscus lens L32 having a convex surface facing the object and a biconvex positive lens L33; and a plano-concave negative lens L34 having a plane facing the image surface I. The image side surface of the positive meniscus lens L31 is of aspherical shape.

The fourth lens group G4 consists of, in order from the object: a cemented lens composed of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object; and a cemented lens composed of a negative meniscus lens L43 having a convex surface facing the object and a biconvex positive lens L44. The image side surface of the positive lens L44 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a biconvex positive lens L51 and a biconcave negative lens L52. The image side surface of the negative lens L52 is of aspherical shape.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a positive meniscus lens L62 having a concave surface facing the object. An air lens is formed between the negative meniscus lens L61 and the positive meniscus lens L62. The image surface I is disposed on the image side of the sixth lens group G6.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I). Note that the positive meniscus lens L31 in the third lens group G3 corresponds to the 3a group. The cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 corresponds to the 3b group. The negative lens L34 in the third lens group G3 corresponds to the 3c group.

The following Table 7 lists values of data on the zoom optical system according to the seventh example.

TABLE 7 [General Data] Zooming ratio 7.854 f3b = 83.59589 f3c = −87.93193 βT3r = 1.0967 βT3b = −0.25066 f123w = 108.15193 f123t = −1180.72115 W M1 M2 T FNO 4.11505 5.74532 6.36855 6.68279 ω 42.27184 21.88249 10.96245 6.04244 Y 20.89 21.70 21.70 21.70 TL 120.45755 140.80075 169.77272 195.4575 [Lens Data] Surface Number R D νd nd  1 164.3654 2.0000 23.80 1.846660  2 73.5155 5.9893 67.90 1.593190  3 −2353.2843 0.1000  4 72.1741 4.8721 46.03 1.721059  5 384.7599 D1(Variable)  6* 168.2036 1.5000 40.66 1.883000  7 15.8326 4.3451  8 −82.6447 1.5000 40.66 1.883000  9 46.2086 0.1000 10 30.2898 4.8789 23.29 1.872769 11 −32.6789 0.7547 12 −24.9555 1.5000 40.66 1.883000 13* −2867.4336 D2(Variable) 14 ∞ 1.5000 (Aperture Stop S) 15* 24.1510 3.7103 57.75 1.633994 16 594.5882 1.0000 17 70.2793 1.5000 35.28 1.801392 18 17.4502 4.9253 46.90 1.702987 19 −111.3896 1.2478 20 −65.1233 1.5000 44.85 1.743972 21 ∞ D3(Variable) 22 132.6869 3.6334 82.57 1.497820 23 −33.2203 1.5000 23.99 1.871866 24 −81.5274 0.1000 25 26.2321 1.5000 40.98 1.869660 26 16.8448 7.0033 57.83 1.512954 27* −36.7178 D4(Variable) 28 100.0646 3.3139 24.26 1.791180 29 −60.0000 1.5000 40.12 1.851080 30* 35.0435 D5(Variable) 31 −19.8065 1.5000 40.79 1.877404 32 −36.0179 0.1000 33 −118.6453 3.6033 27.58 1.755201 34 −51.9780 BF [Aspherical Surface Data] 6th Surface K = 2.0000, A4 = −3.54713E−06, A6 = 8.39421E−09 A8 = 5.74900E−12, A10 = −2.30186E−14, A12 = 0.00000E+00 13th Surface K = 1.0000, A4 = −8.88610E−06, A6 = 8.60054E−10 A8 = 9.35296E−11, A10 = −8.32892E−13, A12 = 0.00000E+00 15th Surface K = 1.0000, A4 = −1.25166E−05, A6 = 2.21212E−08 A8 = −2.03902E−10, A10 = 7.07567E−13, A12 = 0.00000E+00 27th Surface K = 1.0000, A4 = 2.74577E−05, A6 = −5.57744E−08 A8 = 3.60461E−10, A10 = −1.20456E−12, A12 = 0.00000E+00 30th Surface K = 1.0000, A4 = −6.49026E−06, A6 = 5.84808E−08 A8 = −3.26107E−10, A10 = 9.49542E−13, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 99.48878 G2 6 −15.91549 G3 15 36.81358 G4 22 35.33722 G5 28 −59.27007 G6 31 −101.60759 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.70000 50.00001 105.00002 194.00004 D0 ∞ ∞ ∞ ∞ D1 1.50000 16.10146 35.16750 51.29406 D2 17.11600 9.70503 4.20600 1.50000 D3 7.94167 4.05851 2.07803 1.50000 D4 8.59873 5.64789 5.81781 1.50000 D5 9.32368 17.20284 18.29639 22.86408 BF 9.30000 21.40756 37.52953 50.12197 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06152 −0.11064 −0.19039 −0.28955 D0 370.9313 400.5881 451.6162 495.9313 D1 1.50000 16.10146 35.16750 51.29406 D2 17.11600 9.70503 4.20600 1.50000 D3 7.94167 4.05851 2.07803 1.50000 D4 10.20432 7.93636 10.79923 11.04504 D5 7.71809 14.91438 13.31498 13.31904 BF 9.32674 21.49415 37.78613 50.71489 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.710 Conditional Expression(2) TLw/fw = 4.861 Conditional Expression(3) Mv4/Mv3 = 1.158 Conditional Expression(4) Mv2/fw = 1.017 Conditional Expression(5) f3b/f3 = 2.268 Conditional Expression(6) βT3r × (1 − βT3b) = 1.387 Conditional Expression(7) (−f3c)/f3b = 1.047 Conditional Expression(8) (R3c2 + R3c1)/(R3c2 − R3c1) = −1.000 Conditional Expression(9) ft/fw = 7.890 Conditional Expression(10) ωw = 42.272 Conditional Expression(11) ωt = 6.042 Conditional Expression(12) fw/f123w = 0.227 Conditional Expression(13) ft/f123t = −0.171 Conditional Expression(14) BFw/fw = 0.375 Conditional Expression(15) (−f5)/fw = 2.392 Conditional Expression(16) Mv5/Mv6 = 1.332 Conditional Expression(17) Mv1/(ft − fw) = 0.439 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = 1.872

FIGS. 20A and 20B are various aberration graphs of the zoom optical system according to the seventh example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 21A and 21B are coma aberration graphs of the zoom optical system according to the seventh example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the seventh example favorably corrects the various aberrations, and has an excellent imaging performance.

Eighth Example

An eighth example is described with reference to FIGS. 22 to 24A and 24B and Table 8. FIG. 22 is a lens configuration diagram of a zoom optical system according to the eighth example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(8) according to the eighth example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a negative refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in directions indicated by arrows in FIG. 22 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move.

The first lens group G1 consists of, in order from the object: a cemented lens composed of a negative meniscus lens L11 having a convex surface facing the object and a biconvex positive lens L12; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a biconcave negative lens L22; a biconvex positive lens L23; and a negative meniscus lens L24 having a concave surface facing the object. The image side surface of the negative meniscus lens L21 is of aspherical shape.

The third lens group G3 consists of, in order from the object: a biconvex positive lens L31; a cemented lens composed of a negative meniscus lens L32 having a convex surface facing the object and a biconvex positive lens L33; and a negative meniscus lens L34 having a concave surface facing the object.

The fourth lens group G4 consists of, in order from the object: a biconvex positive lens L41; a cemented lens composed of a positive meniscus lens L42 having a concave surface facing the object and a negative meniscus lens L43 having a concave surface facing the object; and a biconvex positive lens L44. The image side surface of the positive lens L44 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a biconvex positive lens L51 and a biconcave negative lens L52. The image side surface of the negative lens L52 is of aspherical shape.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a biconvex positive lens L62. An air lens is formed between the negative meniscus lens L61 and the positive lens L62. The image surface I is disposed on the image side of the sixth lens group G6.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I). Note that the positive lens L31 in the third lens group G3 corresponds to the 3a group. The cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 corresponds to the 3b group. The negative meniscus lens L34 in the third lens group G3 corresponds to the 3c group.

The following Table 8 lists values of data on the zoom optical system according to the eighth example.

TABLE 8 [General Data] Zooming ratio 7.854 f3b = 68.67117 f3c = −50.16504 βT3r = 1.31044 βT3b = −0.14803 f123w = −440.44611 f123t = −323.78995 W M1 M2 T FNO 4.12083 5.77298 6.33626 6.49162 ω 42.50455 22.44807 11.22387 6.10280 Y 20.61 21.70 21.70 21.70 TL 120.46149 143.33661 170.26168 190.2487 [Lens Data] Surface Number R D νd nd  1 119.2532 2.0000 25.26 1.902000  2 75.4740 6.1889 82.57 1.497820  3 −685.9404 0.1000  4 62.0223 5.1009 67.90 1.593190  5 237.4793 D1(Variable)  6* 153.6662 1.5000 46.59 1.816000  7 15.5464 4.2474  8 −40.2333 1.5002 43.79 1.848500  9 79.6309 0.1006 10 32.2669 3.5980 22.74 1.808090 11 −38.3529 0.7346 12 −22.0127 1.5000 43.79 1.848500 13 −91.6465 D2(Variable) 14 ∞ 1.5000 (Aperture Stop S) 15 44.5290 2.6559 44.85 1.743972 16 −81.3774 0.7000 17 33.2106 3.4046 30.99 1.940752 18 19.5338 3.9016 59.70 1.508752 19 −65.3422 1.3372 20 −26.7545 1.5000 29.68 1.730111 21 −101.6153 D3(Variable) 22 33.1030 6.1030 70.40 1.487502 23 −28.7765 0.1000 24 −116.0123 3.4598 68.30 1.507497 25 −28.0491 1.5000 32.03 1.910214 26 −237.5876 0.2542 27 95.5133 3.1295 59.13 1.611115 28* −51.7400 D4(Variable) 29 333.8201 3.4464 22.74 1.808090 30 −49.9705 1.5000 44.82 1.743986 31* 31.2247 D5(Variable) 32 −27.4502 1.5000 66.16 1.531180 33 −59.8926 0.1000 34 164.9552 2.6581 27.80 1.749763 35 −519.6427 BF [Aspherical Surface Data] 6th Surface K = 1.0000, A4 = 2.54661E−06, A6 = 1.57681E−08 A8 = −1.62633E−10, A10 = 6.99665E−13, A12 = 0.00000E+00 28th Surface K = 1.0000, A4 = 2.83706E−05, A6 = −3.41484E−08 A8 = 2.83345E−10, A10 = −4.50609E−13, A12 = 0.00000E+00 31st Surface K = 1.0000, A4 = −4.24770E−06, A6 = 6.21761E−08 A8 = −2.79037E−10, A10 = 4.34156E−13, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 99.94559 G2 6 −15.36108 G3 15 40.04464 G4 22 30.83594 G5 29 −50.14179 G6 32 −238.46610 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.69999 49.99998 104.99995 193.99998 D0 ∞ ∞ ∞ ∞ D1 1.50000 18.29170 34.70486 54.28408 D2 15.49680 10.23739 4.55937 1.50000 D3 10.63532 4.97092 1.81398 1.50000 D4 8.89670 4.43383 5.19646 1.51052 D5 9.31183 19.43911 21.83341 25.83333 BF 9.29998 20.64280 36.83273 40.29998 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06119 −0.09874 −0.16976 −0.27724 D0 371.9273 449.0522 522.1271 502.1400 D1 1.50000 18.29170 34.70486 54.28408 D2 15.49680 10.23739 4.55937 1.50000 D3 10.63532 4.97092 1.81398 1.50000 D4 10.32916 6.26965 9.16937 12.36360 D5 7.87937 17.60328 17.86051 14.98025 BF 9.32282 20.70243 37.00914 40.76930 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.645 Conditional Expression(2) TLw/fw = 4.877 Conditional Expression(3) Mv4/Mv3 = 1.295 Conditional Expression(4) Mv2/fw = 0.688 Conditional Expression(5) f3b/f3 = 1.715 Conditional Expression(6) βT3r × (1 − βT3b) = 1.504 Conditional Expression(7) (−f3c)/f3b = 0.731 Conditional Expression(8) (R3c2 + R3c1)/(R3c2 − R3c1) = 1.715 Conditional Expression(9) ft/fw = 7.854 Conditional Expression(10) ωw = 42.505 Conditional Expression(11) ωt = 6.103 Conditional Expression(12) fw/f123w = −0.056 Conditional Expression(13) ft/f123t = −0.599 Conditional Expression(14) BFw/fw = 0.377 Conditional Expression(15) (−f5)/fw = 2.030 Conditional Expression(16) Mv5/Mv6 = 1.533 Conditional Expression(17) Mv1/(ft − fw) = 0.412 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = 0.467

FIGS. 23A and 23B are various aberration graphs of the zoom optical system according to the eighth example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 24A and 24B are coma aberration graphs of the zoom optical system according to the eighth example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the eighth example favorably corrects the various aberrations, and has an excellent imaging performance.

Ninth Example

A ninth example is described with reference to FIGS. 25 to 27A and 27B and Table 9. FIG. 25 is a lens configuration diagram of a zoom optical system according to the ninth example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(9) according to the ninth example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a negative refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in directions indicated by arrows in FIG. 25 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move.

The first lens group G1 consists of, in order from the object: a cemented lens composed of a negative meniscus lens L11 having a convex surface facing the object and a plano-convex positive lens L12 having a plane facing the image surface I; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a biconcave negative lens L22; a biconvex positive lens L23; and a negative meniscus lens L24 having a concave surface facing the object. The image side surface of the negative meniscus lens L21 is of aspherical shape. The image side surface of the negative meniscus lens L24 is of aspherical shape.

The third lens group G3 consists of, in order from the object: a biconvex positive lens L31; a cemented lens composed of a biconvex positive lens L32 and a negative meniscus lens L33 having a concave surface facing the object; and a cemented lens composed of a biconcave negative lens L34 and a positive meniscus lens L35 having a convex surface facing the object. The image side surface of the positive lens L31 is of aspherical shape. The image side surface of the negative lens L34 is of aspherical shape.

The fourth lens group G4 consists of, in order from the object: a cemented lens composed of a negative meniscus lens L41 having a convex surface facing the object and a biconvex positive lens L42; and a biconvex positive lens L43. The image side surface of the positive lens L43 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a biconvex positive lens L51 and a biconcave negative lens L52.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a biconvex positive lens L62. An air lens is formed between the negative meniscus lens L61 and the positive lens L62. The image surface I is disposed on the image side of the sixth lens group G6.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the cemented lens composed of the negative lens L34 and the positive meniscus lens L35 in the third lens group G3 constitutes a vibration-proof group that has a negative refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I).

The following Table 9 lists values of data on the zoom optical system according to the ninth example.

TABLE 9 [General Data] Zooming ratio 7.854 f3b = −71.26963 βT3r = 0.183 βT3b = 8.802459 f123w = 46.29531 f123t = 1060.13724 W M1 M2 T FNO 4.11505 5.74532 6.36855 6.68279 ω 42.27184 21.88249 10.96245 6.04244 Y 21.03 21.70 21.70 21.70 TL 121.00241 139.79338 169.47903 195.5079 [Lens Data] Surface Number R D νd nd  1 215.1564 1.5000 23.80 1.846660  2 73.5337 7.2326 67.90 1.593190  3 ∞ 0.1000  4 75.0074 5.6048 40.66 1.883000  5 344.8006 D1(Variable)  6* 43.3708 1.5000 40.66 1.883000  7 13.2343 4.8088  8 −47.4291 1.5052 40.66 1.883000  9 43.0037 0.1000 10 28.6036 4.0197 20.88 1.922860 11 −55.9891 1.1418 12 −23.0332 1.5000 40.66 1.883000 13* −75.5957 D2(Variable) 14 ∞ 1.5000 (Aperture Stop S) 15* 28.4224 4.3742 52.85 1.598604 16 −48.8993 0.1504 17 30.2173 5.4129 70.40 1.487490 18 −31.5840 1.5000 21.23 1.903627 19 −130.7132 1.2693 20* −107.8541 1.5000 41.09 1.854203 21 30.6579 3.0466 26.18 1.822542 22 165.6444 D3(Variable) 23 33.3486 1.5007 40.66 1.883000 24 13.1929 6.5567 65.07 1.544771 25 −190.2474 0.7289 26 37.5609 4.7319 62.98 1.574225 27* −76.3130 D4(Variable) 28 80.1779 3.4856 27.58 1.755201 29 −127.8937 1.5007 45.13 1.740338 30 26.5334 D5(Variable) 31 −26.2026 1.5000 60.35 1.619799 32 −54.6221 0.1000 33 586.6701 2.5595 28.29 1.738351 34 −391.8753 BF [Aspherical Surface Data] 6th Surface K = 1.0000, A4 = −6.29772E−06, A6 = −1.23182E−08 A8 = 7.32161E−11, A10 = −3.10876E−13, A12 = 0.00000E+00 13th Surface K = 1.0000, A4 = −8.92953E−06, A6 = −3.71644E−08 A8 = 8.09196E−10, A10 = −5.73691E−12, A12 = 0.00000E+00 15th Surface K = 1.0000, A4 = −1.00000E−05, A6 = 2.20240E−08 A8 = −1.02146E−10, A10 = 0.00000E+00, A12 = 0.00000E+00 20th Surface K = 1.0000, A4 = 3.32815E−06, A6 = 1.66254E−09 A8 = 0.00000E+00, A10 = 0.00000E+00, A12 = 0.00000E+00 27th Surface K = 1.0000, A4 = 1.00000E−05, A6 = −3.83755E−08 A8 = −1.30773E−10, A10 = −1.22891E−12, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 102.37710 G2 6 −14.98474 G3 15 29.62517 G4 23 38.66055 G5 28 −56.76096 G6 31 −113.46417 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.70007 50.00020 105.00052 194.00105 D0 ∞ ∞ ∞ ∞ D1 1.50000 18.30775 37.76411 54.05443 D2 18.03389 8.85777 3.84960 1.50000 D3 6.37316 1.62225 1.50000 1.64117 D4 2.43986 3.20131 6.09526 1.50000 D5 9.22531 23.30380 13.81143 17.88006 BF 13.00010 14.07041 36.02852 48.50219 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.08175 −0.12239 −0.19581 −0.27905 D0 272.2777 353.4868 423.8013 497.7725 D1 1.50000 18.30775 37.76411 54.05443 D2 18.03389 8.85777 3.84960 1.50000 D3 6.37316 1.62225 1.50000 1.64117 D4 4.23169 6.02328 12.47110 12.78692 D5 7.43347 20.48182 7.43559 6.59314 BF 13.03743 14.15445 36.24396 48.93981 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.817 Conditional Expression(2) TLw/fw = 4.899 Conditional Expression(3) Mv4/Mv3 = 1.123 Conditional Expression(4) Mv2/fw = 0.889 Conditional Expression(5) f3b/f3 = −2.406 Conditional Expression(6) βT3r × (1 − βT3b) = −1.428 Conditional Expression(9) ft/fw = 7.887 Conditional Expression(10) ωw = 42.272 Conditional Expression(11) ωt = 6.042 Conditional Expression(12) fw/f123w = 0.534 Conditional Expression(13) ft/f123t = 0.179 Conditional Expression(14) BFw/fw = 0.526 Conditional Expression(15) (−f5)/fw = 2.298 Conditional Expression(16) Mv5/Mv6 = 1.244 Conditional Expression(17) Mv1/(ft − fw) = 0.438 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = 0.830

FIGS. 26A and 26B are various aberration graphs of the zoom optical system according to the ninth example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 27A and 27B are coma aberration graphs of the zoom optical system according to the ninth example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the ninth example favorably corrects the various aberrations, and has an excellent imaging performance.

Tenth Example

A tenth example is described with reference to FIGS. 28 to 30A and 30B and Table 10. FIG. 28 is a lens configuration diagram of a zoom optical system according to the tenth example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(10) according to the tenth example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a negative refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in directions indicated by arrows in FIG. 28 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move.

The first lens group G1 consists of, in order from the object: a cemented lens composed of a negative meniscus lens L11 having a convex surface facing the object and a positive meniscus lens L12 having a convex surface facing the object; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a biconcave negative lens L22; a biconvex positive lens L23; and a biconcave negative lens L24.

The third lens group G3 consists of, in order from the object: a positive meniscus lens L31 having a convex surface facing the object; a cemented lens composed of a negative meniscus lens L32 having a convex surface facing the object and a biconvex positive lens L33; and a negative meniscus lens L34 having a concave surface facing the object.

The fourth lens group G4 consists of, in order from the object: a cemented lens composed of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object; and a cemented lens composed of a negative meniscus lens L43 having a convex surface facing the object and a biconvex positive lens L44. The image side surface of the positive lens L44 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a biconvex positive lens L51 and a biconcave negative lens L52. The image side surface of the negative lens L52 is of aspherical shape.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a biconvex positive lens L62. An air lens is formed between the negative meniscus lens L61 and the positive lens L62. The image surface I is disposed on the image side of the sixth lens group G6.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I). Note that the positive meniscus lens L31 in the third lens group G3 corresponds to the 3a group. The cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 corresponds to the 3b group. The negative meniscus lens L34 in the third lens group G3 corresponds to the 3c group.

The following Table 10 lists values of data on the zoom optical system according to the tenth example.

TABLE 10 [General Data] Zooming ratio 4.692 f3b = 69.37403 f3c = −49.72587 βT3r = 0.65967 βT3b = −1.19892 f123w = −96.28619 f123t = −88.05735 W M1 M2 T FNO 3.66063 4.51062 5.00831 5.83006 ω 42.43419 22.44766 13.66195 10.17394 Y 20.54 21.70 21.70 21.70 TL 116.50601 138.64669 160.34507 171.5048 [Lens Data] Surface Number R D νd nd  1 200.0000 2.0000 23.80 1.846660  2 108.2337 4.6568 70.32 1.487490  3 1133.5711 0.1000  4 68.7807 5.7029 70.32 1.487490  5 816.5190 D1(Variable)  6 102.0974 1.2000 46.59 1.816000  7 17.6075 4.9760  8 −59.3363 1.1000 51.28 1.659368  9 81.2225 0.1000 10 29.1388 3.9898 23.80 1.846660 11 −107.8110 0.8213 12 −38.4600 1.0000 46.59 1.816000 13 157.0586 D2(Variable) 14 ∞ 2.0000 (Aperture Stop S) 15 41.9442 2.5619 35.72 1.902650 16 552.5411 0.5000 17 41.0223 0.9000 29.12 2.001000 18 23.0700 4.0200 53.74 1.579570 19 −69.7834 1.5452 20 −27.7457 1.0000 32.33 1.953750 21 −68.0384 D3(Variable) 22 33.5256 5.9460 46.59 1.816000 23 −23.9703 1.0000 32.35 1.850260 24 −83.2531 0.1000 25 30.5301 1.1000 32.35 1.850260 26 14.8810 10.3852 70.32 1.487490 27* −119.0936 D4(Variable) 28 81.3890 3.7144 23.80 1.846660 29 −48.0181 1.0000 42.73 1.834810 30* 23.7254 D5(Variable) 31 −24.5058 1.4000 46.59 1.816000 32 −48.4638 0.1000 33 142.4943 3.2707 37.57 1.683760 34 −160.0000 BF [Aspherical Surface Data] 27th Surface K = 1.0000, A4 = 4.39579E−05, A6 = −4.15837E−09 A8 = 6.65149E−10, A10 = 0.00000E+00, A12 = 0.00000E+00 30th Surface K = 1.0000, A4 = −2.71688E−06, A6 = 1.79186E−08 A8 = −3.84607E−10, A10 = 0.00000E+00, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 143.63567 G2 6 −20.08403 G3 15 60.03586 G4 22 25.77538 G5 28 −42.36974 G6 31 −151.12346 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.72617 50.01050 85.01086 116.00340 D0 ∞ ∞ ∞ ∞ D1 1.50000 23.91054 40.85381 47.19819 D2 17.00636 9.20443 4.57783 1.50000 D3 9.28353 3.49337 1.15783 0.30000 D4 2.84012 1.14718 1.49326 3.00287 D5 7.97989 15.46299 17.45245 16.80067 BF 11.70601 19.23807 28.61979 36.51305 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06049 −0.09676 −0.16160 −0.22064 D0 377.2840 455.1463 433.4475 422.2840 D1 1.50000 23.91054 40.85381 47.19819 D2 17.00636 9.20443 4.57783 1.50000 D3 9.28353 3.49337 1.15783 0.30000 D4 3.90798 2.82710 4.74497 7.99347 D5 6.91203 13.78307 14.20074 11.81007 BF 11.72550 19.28822 28.75888 36.77070 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.728 Conditional Expression(2) TLw/fw = 4.712 Conditional Expression(3) Mv4/Mv3 = 1.362 Conditional Expression(4) Mv2/fw = 0.376 Conditional Expression(5) f3b/f3 = 1.156 Conditional Expression(6) βT3r × (1 − βT3b) = 1.451 Conditional Expression(7) (−f3c)/f3b = 0.717 Conditional Expression(8) (R3c2 + R3c1)/(R3c2 − R3c1) = 2.377 Conditional Expression(9) ft/fw = 4.692 Conditional Expression(10) ωw = 42.434 Conditional Expression(11) ωt = 10.174 Conditional Expression(12) fw/f123w = −0.257 Conditional Expression(13) ft/f123t = −1.323 Conditional Expression(14) BFw/fw = 0.473 Conditional Expression(15) (−f5)/fw = 1.714 Conditional Expression(16) Mv5/Mv6 = 1.356 Conditional Expression(17) Mv1/(ft − fw) = 0.603 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = 0.492

FIGS. 29A and 29B are various aberration graphs of the zoom optical system according to the tenth example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 30A and 30B are coma aberration graphs of the zoom optical system according to the tenth example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the tenth example favorably corrects the various aberrations, and has an excellent imaging performance.

Eleventh Example

An eleventh example is described with reference to FIGS. 31 to 33A and 33B and Table 11. FIG. 31 is a lens configuration diagram of a zoom optical system according to the eleventh example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(11) according to the eleventh example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a negative refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in directions indicated by arrows in FIG. 31 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move.

The first lens group G1 consists of, in order from the object: a cemented lens composed of a negative meniscus lens L11 having a convex surface facing the object and a positive meniscus lens L12 having a convex surface facing the object; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a biconcave negative lens L22; a biconvex positive lens L23; and a negative meniscus lens L24 having a concave surface facing the object.

The third lens group G3 consists of, in order from the object: a biconvex positive lens L31; a cemented lens composed of a negative meniscus lens L32 having a convex surface facing the object and a biconvex positive lens L33; and a negative meniscus lens L34 having a concave surface facing the object.

The fourth lens group G4 consists of, in order from the object: a cemented lens composed of a biconvex positive lens L41 and a biconcave negative lens L42; and a cemented lens composed of a negative meniscus lens L43 having a convex surface facing the object and a biconvex positive lens L44. The image side surface of the positive lens L44 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a positive meniscus lens L51 having a concave surface facing the object and a biconcave negative lens L52. The image side surface of the negative lens L52 is of aspherical shape.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a biconvex positive lens L62. An air lens is formed between the negative meniscus lens L61 and the positive lens L62. The image surface I is disposed on the image side of the sixth lens group G6.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I). Note that the positive lens L31 in the third lens group G3 corresponds to the 3a group. The cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 corresponds to the 3b group. The negative meniscus lens L34 in the third lens group G3 corresponds to the 3c group.

The following Table 11 lists values of data on the zoom optical system according to the eleventh example.

TABLE 11 [General Data] Zooming ratio 3.438 f3b = 81.35467 f3c = −97.36367 βT3r = 0.25117 βT3b = −2.9813 f123w = 2466.12612 f123t = −146.93338 W M1 M2 T FNO 3.65039 4.00020 — 4.50024 ω 43.52469 −22.45389 — 13.66502 Y 21.27 21.70 — 21.70 TL 116.50677 138.27327 — 161.50351 [Lens Data] Surface Number R D νd nd  1 200.0000 2.0000 23.80 1.846660  2 112.4996 4.3442 70.32 1.487490  3 642.3642 0.1000  4 64.3082 6.0839 70.32 1.487490  5 1033.4518 D1(Variable)  6 91.5822 1.2000 46.59 1.816000  7 16.7434 5.0969  8 −135.4549 1.1000 50.66 1.670176  9 31.8729 0.1000 10 24.8799 4.1715 23.80 1.846660 11 −336.6794 1.4309 12 −32.2164 1.0000 46.59 1.816000 13 −277.8484 D2(Variable) 14 ∞ 2.0000 (Aperture Stop S) 15 41.4933 2.7587 43.79 1.848500 16 −1372.9949 0.5000 17 55.1173 0.9000 34.87 1.847939 18 24.3945 4.0805 56.69 1.586546 19 −76.2325 1.8582 20 −25.5665 1.0000 34.04 1.847872 21 −37.7016 D3(Variable) 22 46.4011 6.1027 46.59 1.816000 23 −43.4919 1.0000 26.59 1.847083 24 397.5382 0.1000 25 28.7499 1.1000 32.35 1.850260 26 18.0000 11.1086 70.32 1.487490 27* −25.6478 D4(Variable) 28 −713.8966 3.6653 23.80 1.846660 29 −42.0000 1.0000 45.28 1.796882 30* 31.7158 D5(Variable) 31 −19.7135 1.4000 62.26 1.536206 32 −42.7591 0.1000 33 217.1940 3.3164 37.57 1.683760 34 −160.0000 BF [Aspherical Surface Data] 27th Surface K = 1.0000, A4 = 6.15332E−05, A6 = −2.11407E−07 A8 = 7.47121E−10, A10 = −1.12141E−12, A12 = 0.00000E+00 30th Surface K = 1.0000, A4 = −1.68999E−05, A6 = 1.65258E−07 A8 = −4.68439E−10, A10 = 7.74341E−13, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 135.65910 G2 6 −17.91192 G3 15 42.22744 G4 22 26.33888 G5 28 −39.70963 G6 31 −150.62287 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.72587 50.00755 — 85.00361 D0 ∞ ∞ — ∞ D1 1.50000 24.03902 — 40.38368 D2 13.72037 5.30562 — 1.50000 D3 8.95150 2.76337 — 0.30000 D4 1.97894 1.51459 — 1.15589 D5 10.03133 16.68380 — 19.50588 BF 11.70677 19.34900 — 30.04020 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06066 −0.11959 — −0.19908 D0 377.2840 355.5169 — 332.2840 D1 1.50000 24.03902 — 40.38368 D2 13.72037 5.30562 — 1.50000 D3 8.95150 2.76337 — 0.30000 D4 2.78309 3.22774 — 4.28073 D5 9.22718 14.97065 — 16.38104 BF 11.72684 19.42705 — 30.25539 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.665 Conditional Expression(2) TLw/fw = 4.712 Conditional Expression(3) Mv4/Mv3 = 1.472 Conditional Expression(4) Mv2/fw = 0.247 Conditional Expression(5) f3b/f3 = 1.927 Conditional Expression(6) βT3r × (1 − βT3b) = 1.000 Conditional Expression(7) (−f3c)/f3b = 1.197 Conditional Expression(8) (R3c2 + R3c1)/(R3c2 − R3c1) = 5.214 Conditional Expression(9) ft/fw = 3.438 Conditional Expression(10) ωw = 43.525 Conditional Expression(11) ωt = 13.665 Conditional Expression(12) fw/f123w = 0.010 Conditional Expression(13) ft/f123t = −0.579 Conditional Expression(14) BFw/fw = 0.473 Conditional Expression(15) (−f5)/fw = 1.616 Conditional Expression(16) Mv5/Mv6 = 1.517 Conditional Expression(17) Mv1/(ft − fw) = 0.746 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = 0.671

FIGS. 32A and 32B are various aberration graphs of the zoom optical system according to the eleventh example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 33A and 33B are coma aberration graphs of the zoom optical system according to the eleventh example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the eleventh example favorably corrects the various aberrations, and has an excellent imaging performance.

Twelfth Example

A twelfth example is described with reference to FIGS. 34 to 36A and 36B and Table 12. FIG. 34 is a lens configuration diagram of a zoom optical system according to the twelfth example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(12) according to the twelfth example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; and a fifth lens group G5 having a negative refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4 and the fifth lens group G5 move in directions indicated by arrows in FIG. 34 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the fifth lens group G5 integrally move.

The first lens group G1 consists of, in order from the object: a negative meniscus lens L11 having a convex surface facing the object; a biconvex positive lens L12; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a biconcave negative lens L22; a biconvex positive lens L23; and a negative meniscus lens L24 having a concave surface facing the object.

The third lens group G3 consists of, in order from the object: a biconvex positive lens L31; a cemented lens composed of a negative meniscus lens L32 having a convex surface facing the object and a biconvex positive lens L33; and a biconcave negative lens L34.

The fourth lens group G4 consists of, in order from the object: a cemented lens composed of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object; a cemented lens composed of a negative meniscus lens L43 having a convex surface facing the object and a biconvex positive lens L44; and a cemented lens composed of a biconvex positive lens L45 and a biconcave negative lens L46. The image side surface of the positive lens L44 is of aspherical shape. The image side surface of the negative lens L46 is of aspherical shape.

The fifth lens group G5 consists of, in order from the object: a negative meniscus lens L51 having a concave surface facing the object; and a biconvex positive lens L52. The image side surface of the negative meniscus lens L51 is of aspherical shape. The image surface I is disposed on the image side of the fifth lens group G5.

In this example, by moving the cemented lens composed of the positive lens L45 and the negative lens L46 in the fourth lens group G4 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. Note that upon zooming with focusing on the short distant object, the cemented lens composed of the positive lens L45 and the negative lens L46, which serves as a focusing group, moves by a different amount of movement, with respect to the cemented lens composed of the positive lens L41 and the negative meniscus lens L42, and the cemented lens composed of the negative meniscus lens L43 and the positive lens L44 in the fourth lens group. Upon zooming with focusing on the infinity object, all the lenses of the fourth lens group G4 integrally move. In this example, the cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I). Note that the positive lens L31 in the third lens group G3 corresponds to the 3a group. The cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 corresponds to the 3b group. The negative lens L34 in the third lens group G3 corresponds to the 3c group.

The following Table 12 lists values of data on the zoom optical system according to the twelfth example.

TABLE 12 [General Data] Zooming ratio 7.848 f3b = 65.27589 f3c = −42.33416 βT3r = 1.55778 βT3b = −0.11227 f123w = −297.77158 f123t = −199.23081 W M1 M2 T FNO 4.12000 5.69956 6.30000 6.50003 ω 42.96973 22.56096 11.03929 6.08825 Y 21.29 21.70 21.70 21.70 TL 129.0507 143.6432 173.1936 191.4323 [Lens Data] Surface Number R D νd nd  1 181.0189 2.0855 31.27 1.90366  2 74.7364 0.8982  3 78.3131 6.0267 67.90 1.59319  4 −878.3490 0.1429  5 65.0716 4.8340 67.90 1.59319  6 661.4054 D1(Variable)  7 171.3932 1.1000 35.72 1.90265  8 18.9469 5.2527  9 −57.6716 1.0000 52.33 1.75500 10 53.7286 0.4722 11 34.8478 3.1650 20.88 1.92286 12 −81.2943 1.3566 13 −31.9419 0.9000 46.59 1.81600 14 −487.1030 D2(Variable) 15 ∞ 2.0101 (Aperture Stop S) 16 45.9039 2.3316 35.72 1.90265 17 −163.4046 0.5000 18 33.6170 1.1581 29.12 2.00100 19 19.7670 3.5655 53.74 1.57957 20 −85.9122 1.3700 21 −41.3606 1.0329 32.33 1.95375 22 1717.1475 D3(Variable) 23 37.7633 4.9751 42.73 1.83481 24 −38.9447 1.0000 31.27 1.90366 25 −804.1582 0.1000 26 29.7427 3.0986 32.33 1.95375 27 15.4408 8.8739 81.49 1.49710 28* −39.9876 D4(Variable) 29 10338.5730 3.6738 23.80 1.84666 30 −27.6080 1.0000 40.13 1.85135 31* 31.8891 D5(Variable) 32 −29.8624 1.4000 40.13 1.85135 33* −63.8559 0.1000 34 66.4034 4.5715 37.57 1.68376 35 −424.4531 BF [Aspherical Surface Data] 28th Surface K = 1.0000, A4 = 2.91470E−05, A6 = −1.17772E−07 A8 = 9.21285E−10, A10 = −5.94865E−12, A12 = 0.14842E−13 31st Surface K = 1.0000, A4 = −5.83910E−06, A6 = 1.34714E−07 A8 = −1.32747E−09, A10 = 8.60735E−12, A12 = −0.22325E−13 33rd Surface K = 1.0000, A4 = 4.26328E−06, A6 = −4.06929E−09 A8 = 4.06528E−11, A10 = −1.22140E−13, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 105.7291 G2 7 −16.8196 G3 16 48.27007 G4 23 44.51528 G5 32 −372.043 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.72000 49.99999 104.99993 194.00004 D0 ∞ ∞ ∞ ∞ D1 1.73220 15.73205 40.41864 55.46338 D2 20.01315 10.99318 5.91904 1.09143 D3 13.56296 6.37783 3.44003 1.69135 D4 4.09147 4.09147 4.09147 4.09147 D5 9.90112 17.08625 20.02405 21.77273 BF 11.75486 21.36749 31.30545 39.32701 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06144 −0.10950 −0.17803 −0.26497 D0 370.94930 406.35680 476.80640 558.56770 D1 1.73220 15.73205 40.41864 55.46338 D2 20.01315 10.99318 5.91904 1.09143 D3 13.56296 6.37783 3.44003 1.69135 D4 4.89647 5.55202 7.55497 11.91843 D5 9.09612 15.62570 16.56055 13.94577 BF 11.75486 21.36749 31.30545 39.32701 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.717 Conditional Expression(2) TLw/fw = 5.220 Conditional Expression(3) Mv4/Mv3 = 1.614 Conditional Expression(4) Mv2/fw = 0.350 Conditional Expression(5) f3b/f3 = 1.352 Conditional Expression(6) βT3r × (1 − 0T3b) = 1.733 Conditional Expression(7) (−f3c)/f3b = 0.649 Conditional Expression(8) (R3c2 + R3c1)/(R3c2 − R3c1) = 0.953 Conditional Expression(9) ft/fw = 7.848 Conditional Expression(10) ωw = 42.970 Conditional Expression(11) ωt = 6.088 Conditional Expression(12) fw/f123w = −0.083 Conditional Expression(13) ft/f123t = −0.974 Conditional Expression(14) BFw/fw = 0.476 Conditional Expression(15) (−f5)/fw = 15.051 Conditional Expression(17) Mv1/(ft − fw) = 0.369

FIGS. 35A and 35B are various aberration graphs of the zoom optical system according to the twelfth example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 36A and 36B are coma aberration graphs of the zoom optical system according to the twelfth example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the twelfth example favorably corrects the various aberrations, and has an excellent imaging performance.

Thirteenth Example

A thirteenth example is described with reference to FIGS. 37 to 39A and 39B and Table 13. FIG. 37 is a lens configuration diagram of a zoom optical system according to the thirteenth example upon focusing on infinity in a wide angle end state. The zoom optical system ZL(13) according to the thirteenth example consists of, in order from the object: a first lens group G1 having a positive refractive power; a second lens group G2 having a negative refractive power; an aperture stop S; a third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; a sixth lens group G6 having a negative refractive power; and a seventh lens group G7 having a positive refractive power. Upon zooming from the wide angle end state to the telephoto end state, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, the fourth lens group G4, the fifth lens group G5 and the sixth lens group G6 move in directions indicated by arrows in FIG. 37 along the optical axis, and the distances between the adjacent lens groups change. Note that upon zooming, the aperture stop S, the third lens group G3 and the sixth lens group G6 integrally move. Upon zooming, the seventh lens group G7 is fixed with respect to the image surface I.

The first lens group G1 consists of, in order from the object: a negative meniscus lens L11 having a convex surface facing the object; a biconvex positive lens L12; and a positive meniscus lens L13 having a convex surface facing the object.

The second lens group G2 consists of, in order from the object: a negative meniscus lens L21 having a convex surface facing the object; a biconcave negative lens L22; a biconvex positive lens L23; and a negative meniscus lens L24 having a concave surface facing the object.

The third lens group G3 consists of, in order from the object: a biconvex positive lens L31; a cemented lens composed of a negative meniscus lens L32 having a convex surface facing the object and a biconvex positive lens L33; and a negative meniscus lens L34 having a concave surface facing the object.

The fourth lens group G4 consists of, in order from the object: a cemented lens composed of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object; and a cemented lens composed of a negative meniscus lens L43 having a convex surface facing the object and a biconvex positive lens L44. The image side surface of the positive lens L44 is of aspherical shape.

The fifth lens group G5 consists of a cemented lens composed of a biconvex positive lens L51 and a biconcave negative lens L52. The image side surface of the negative lens L52 is of aspherical shape.

The sixth lens group G6 consists of, in order from the object: a negative meniscus lens L61 having a concave surface facing the object; and a biconvex positive lens L62. An air lens is formed between the negative meniscus lens L61 and the positive lens L62.

The seventh lens group G7 consists of a positive meniscus lens L71 having a concave surface facing the object. An image surface I is disposed on the image side of the seventh lens group G7.

In this example, by moving the fifth lens group G5 toward the image surface I, focusing from a far distant object to a short distant object (from an infinity object to a finite distance object) is achieved. In this example, the cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 constitutes a vibration-proof group that has a positive refractive power and is movable in a direction perpendicular to the optical axis, and corrects the displacement of the imaging position due to camera shake and the like (an image blur on the image surface I). Note that the positive lens L31 in the third lens group G3 corresponds to the 3a group. The cemented lens composed of the negative meniscus lens L32 and the positive lens L33 in the third lens group G3 corresponds to the 3b group. The negative meniscus lens L34 in the third lens group G3 corresponds to the 3c group.

The following Table 13 lists values of data on the zoom optical system according to the thirteenth example.

TABLE 13 [General Data] Zooming ratio 7.852 f3b = 65.58114 f3c = −42.91598 βT3r = 1.54065 βT3b = −0.01124 f123w = −242.5247 f123t = −265.90409 W M1 M2 T FNO 4.12000 5.69956 6.30000 6.50003 ω 42.96973 22.56096 11.03929 6.08825 Y 20.93 21.70 21.70 21.70 TL 127.52968 144.84356 169.66796 191.04949 [Lens Data] Surface Number R D νd nd  1 183.1489 1.7000 31.27 1.90366  2 76.2993 0.8845  3 78.7954 6.1936 67.90 1.59319  4 −594.6799 0.1000  5 61.9988 5.6077 67.90 1.59319  6 371.0839 D1(Variable)  7 190.1957 1.1000 35.72 1.90265  8 19.1266 5.1112  9 −52.1202 1.0000 52.33 1.75500 10 58.1840 0.5132 11 36.9591 3.1252 20.88 1.92286 12 −69.4993 0.6909 13 −34.0835 0.9000 46.59 1.81600 14 −15713.5710 D2(Variable) 15 ∞ 2.0000 (Aperture Stop S) 16 40.7989 2.3289 35.72 1.90265 17 −299.8253 0.5000 18 38.9427 1.0000 29.12 2.00100 19 21.5486 3.5304 53.74 1.57957 20 −63.7114 1.3676 21 −35.4002 1.0000 32.33 1.95375 22 −265.5862 D3(Variable) 23 37.7375 4.7476 42.73 1.83481 24 −37.5607 1.0000 31.27 1.90366 25 −325.9958 0.1000 26 31.4406 3.1004 32.33 1.95375 27 15.3849 8.5803 81.49 1.49710 28* −42.3410 D4(Variable) 29 572.4423 3.1728 23.80 1.84666 30 −34.5910 1.0000 40.13 1.85135 31* 31.5461 D5(Variable) 32 −19.9700 1.4000 40.13 1.85135 33* −28.8707 0.1000 34 136.4370 3.5760 37.57 1.68376 35 −114.7970 D6(Variable) 36 −118.5432 2.3370 63.88 1.51680 37 −70.3002 BF [Aspherical Surface Data] 28th Surface K = 1.0000, A4 = 3.78774E−05, A6 = −4.14498E−07 A8 = 6.80734E−09, A10 = −6.10728E−11, A12 = 0.20806E−12 31st Surface K = 1.0000, A4 = −1.36815E−05, A6 = 2.49099E−07 A8 = −3.33308E−09, A10 = 2.73107E−11, A12 = −0.88099E−13 33rd Surface K = 1.0000, A4 = 1.98989E−06, A6 = −1.03153E−08 A8 = 4.34935E−11, A10 = −1.04756E−13, A12 = 0.00000E+00 [Lens Group Data] Group First surface Focal length G1 1 103.06116 G2 7 −17.00821 G3 16 49.18043 G4 23 29.23287 G5 29 −39.13048 G6 32 −1300.48544 G7 36 328.82617 [Variable Distance Data] W M1 M2 T Infinity Infinity Infinity Infinity f 24.72000 50.00000 104.99999 194.09403 D0 ∞ ∞ ∞ ∞ D1 1.50000 17.37231 39.57659 56.44287 D2 19.29037 11.03703 4.56142 1.16368 D3 12.96315 6.13632 3.05308 1.47831 D4 4.87593 4.10851 5.56324 1.90252 D5 9.73283 17.32708 18.95559 24.19108 D6 0.80000 10.49492 19.59067 27.50369 BF 10.60000 10.59999 10.59998 10.59995 W M1 M2 T Short- Short- Short- Short- distance distance distance distance β −0.06123 −0.10885 −0.17758 −0.28031 D0 372.47030 405.15640 480.33200 508.95050 D1 1.50000 17.37231 39.57659 56.44287 D2 19.29037 11.03703 4.56142 1.16368 D3 12.96315 6.13632 3.05308 1.47831 D4 5.77372 5.76435 9.89727 11.65975 D5 8.83504 15.67124 14.62157 14.43385 D6 0.80000 10.49492 19.59067 27.50369 BF 11.75486 21.36749 31.30545 39.32701 [Conditional expression corresponding value] Conditional Expression(1) Df/Dr = 0.689 Conditional Expression(2) TLw/fw = 5.159 Conditional Expression(3) Mv4/Mv3 = 1.430 Conditional Expression(4) Mv2/fw = 0.347 Conditional Expression(5) f3b/f3 = 1.333 Conditional Expression(6) βT3r × (1 − βT3b) = 1.558 Conditional Expression(7) (−f3c)/f3b = 0.654 Conditional Expression(8) (R3c2 + R3c1)/(R3c2 − R3c1) = −1.308 Conditional Expression(9) ft/fw = 7.852 Conditional Expression(10) ωw = 42.970 Conditional Expression(11) ωt = 6.088 Conditional Expression(12) fw/f123w = −0.102 Conditional Expression(13) ft/f123t = −0.730 Conditional Expression(14) BFw/fw = 0.429 Conditional Expression(15) (−f5)/fw = 1.583 Conditional Expression(16) Mv5/Mv6 = 1.541 Conditional Expression(17) Mv1/(ft − fw) = 0.375 Conditional Expression(18) (RAr2 + RAr1)/(RAr2 − RAr1) = −0.651

FIGS. 38A and 38B are various aberration graphs of the zoom optical system according to the thirteenth example upon focusing on infinity in the wide-angle end state and the telephoto end state. FIGS. 39A and 39B are coma aberration graphs of the zoom optical system according to the thirteenth example in the wide-angle end state and the telephoto end state when blur correction is performed. The various aberration graphs show that the zoom optical system according to the thirteenth example favorably corrects the various aberrations, and has an excellent imaging performance.

According to each example, the zoom optical system with various aberrations, such as the spherical aberration, being favorably corrected, can be achieved.

Here, each of the examples described above indicates a specific example of the invention of the present application. The invention of the present application is not limited thereto.

Note that the following details can be appropriately adopted in a range without degrading the optical performance of the zoom optical system according to this embodiment.

As numerical examples of the zoom optical system, systems having the five-, six- and seven-element group configurations have been described. However, the present application is not limited thereto. A zoom optical system having another group configuration (for example, a four- or eight-element group configuration) may be configured. Specifically, a configuration may be adopted where a lens or a lens group is added on the most-object side or the most-image side of the zoom optical system. Note that the lens group indicates a portion that includes at least one lens separated by air distances changing during zooming.

The lens surface may be formed to be a spherical surface or a plane, or formed to be an aspherical surface. A case where lens surfaces are spherical surfaces or planes is preferable because the case facilitates processing, assembly and adjustment of lenses, and can prevent degradation of optical performances due to errors in the processing, assembly and adjustment. Furthermore, it is preferable because degradation of drawing performances is small even in case the image surface deviates.

In a case where the lens surface is an aspherical surface, the aspherical surface may be any of an aspherical surface made by a grinding process, a glass mold aspherical surface made by forming glass into an aspherical shape with a mold, and a composite type aspherical surface made by forming a resin on a surface of glass into an aspherical shape. The lens surface may be a diffractive surface. The lens may be a gradient-index lens (GRIN lens), or a plastic lens.

To reduce flares and ghosts and achieve a high optical performance having a high contrast, an antireflection film having a high transmissivity over a wide wavelength region may be applied to each lens surface. Accordingly, flares and ghosts can be reduced, and high optical performances having a high contrast can be achieved.

EXPLANATION OF NUMERALS AND CHARACTERS G1 First lens group G2 Second lens group G3 Third lens group G4 Fourth lens group G5 Fifth lens group G6 Sixth lens group G7 Seventh lens group I Image surface S Aperture stop 

1. A zoom optical system, comprising, in order from an object: a first lens group having a positive refractive power; and a second lens group having a negative refractive power, wherein upon zooming, a distance between the adjacent lens groups changes, and the zoom optical system further comprises an aperture stop disposed closer to an image than the second lens group, and satisfies the following conditional expression: 0.10<Df/Dr<0.90 where Df: a distance to the aperture stop from a lens surface of the zoom optical system closest to an object in a wide angle end state, and Dr: a distance from the aperture stop to a lens surface of the zoom optical system closest to the image in the wide angle end state.
 2. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group; and a sixth lens group, wherein the aperture stop is disposed between the second lens group and the fourth lens group.
 3. The zoom optical system according to claim 1, wherein the zoom optical system satisfies the following conditional expression: 1.00<TLw/fw<7.50 where TLw: an entire length of the zoom optical system in the wide angle end state, and fw: a focal length of the zoom optical system in the wide angle end state.
 4. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group; and a sixth lens group, wherein the zoom optical system satisfies the following conditional expression: 1.00<Mv4/Mv3<3.00 where Mv3: an amount of movement of the third lens group upon zooming from the wide angle end state to a telephoto end state (a sign of the amount of movement toward an object is shown as +), and Mv4: an amount of movement of the fourth lens group upon zooming from the wide angle end state to the telephoto end state (the sign of the amount of movement toward an object is shown as +).
 5. The zoom optical system according to claim 1, wherein the zoom optical system satisfies the following conditional expression: 0.00<Mv2/fw<10.00 where Mv2: an amount of movement of the second lens group upon zooming from the wide angle end state to a telephoto end state (a sign of the amount of movement toward an object is shown as +), and fw: a focal length of the zoom optical system in the wide angle end state.
 6. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group; and a sixth lens group, wherein upon zooming, a plurality of the lens groups in the zoom optical system move, and distances of the adjacent lens groups change, and the lens group closest to the image among the lens groups moving upon zooming, and the aperture stop integrally move upon zooming.
 7. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group; and a sixth lens group, wherein upon zooming, a plurality of the lens groups including the third lens group in the zoom optical system move, and distances of the adjacent lens groups change, and the lens group closest to the image among the lens groups moving upon zooming, and the third lens group integrally move upon zooming.
 8. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group; and a sixth lens group, wherein the sixth lens group consists of two or more lenses.
 9. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group; and a sixth lens group, wherein at least one pair among pairs of the sixth lens group and the aperture stop, of the sixth lens group and the third lens group, and of the aperture stop and the third lens group integrally moves upon zooming.
 10. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group; and a sixth lens group, wherein the third lens group includes a vibration-proof group that has a positive refractive power and is movable so as to have a displacement component in a direction perpendicular to an optical axis.
 11. The zoom optical system according to claim 10, wherein the zoom optical system satisfies the following conditional expression: 0.50<f3b/f3<4.00 where f3b: a focal length of the vibration-proof group, and f3: a focal length of the third lens group.
 12. The zoom optical system according to claim 10, wherein the zoom optical system satisfies the following conditional expression: 0.50<βT3r×(1−βT3b)<4.00 where βT3r: a magnification of the lens groups consisting of lenses disposed closer to the image than the vibration-proof group in a telephoto end state, and βT3b: a magnification of the vibration-proof group in the telephoto end state.
 13. The zoom optical system according to claim 10, wherein the vibration-proof group includes a positive lens, and a negative lens.
 14. The zoom optical system according to claim 10, wherein the third lens group consists of, in order from the object: a 3a group, a 3b group, and a 3c group, and the 3b group is the vibration-proof group.
 15. The zoom optical system according to claim 14, wherein the zoom optical system satisfies the following conditional expression: 0.20<(−f3c)/f3b<1.50 where f3c: a focal length of the 3c group, and f3b: a focal length of the vibration-proof group.
 16. The zoom optical system according to claim 14, wherein the 3c group consists of a single lens.
 17. The zoom optical system according to claim 14, wherein the 3c group consists of a negative single lens, and the zoom optical system satisfies the following conditional expression: −1.50<(R3c2+R3c1)/(R3c2−R3c1)<5.50 where R3c1: a radius of curvature of an object-side lens surface of the negative single lens of the 3c group, and R3c2: a radius of curvature of an image-side lens surface of the negative single lens of the 3c group.
 18. The zoom optical system according to claim 1, wherein the zoom optical system satisfies the following conditional expression: 3.00<ft/fw<30.00 where ft: a focal length of the zoom optical system in a telephoto end state, and fw: a focal length of the zoom optical system in the wide angle end state.
 19. The zoom optical system according to claim 1, wherein the zoom optical system satisfies the following conditional expression: 35.0°<ωw<75.0° where ωw: a half angle of view of the zoom optical system in the wide-angle end state.
 20. The zoom optical system according to claim 1, wherein the zoom optical system satisfies the following conditional expression: 2.5°<ωt<15.0° where ωt: a half angle of view of the zoom optical system in a telephoto end state.
 21. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; and a third lens group having a positive refractive power, wherein the zoom optical system satisfies the following conditional expression: −0.30<fw/f123w<0.60 where fw: a focal length of the zoom optical system in the wide angle end state, and f123w: a combined focal length of the first lens group, the second lens group and the third lens group in the wide angle end state.
 22. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; and a third lens group having a positive refractive power, wherein the zoom optical system satisfies the following conditional expression: −1.50<ft/f123t<1.00 where ft: a focal length of the zoom optical system in a telephoto end state, and f123t: a combined focal length of the first lens group, the second lens group and the third lens group in a telephoto end state.
 23. The zoom optical system according to claim 1, wherein the zoom optical system satisfies the following conditional expression: 0.20<BFw/fw<0.60 where BFw: a distance to an image surface from a lens surface of the zoom optical system closest to the image in the wide angle end state, and fw: a focal length of the zoom optical system in the wide angle end state.
 24. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; and a fifth lens group, wherein upon focusing, the fifth lens group moves with respect to the image surface.
 25. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; and a fifth lens group, wherein the fifth lens group includes at least one positive lens, and at least one negative lens.
 26. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; and a fifth lens group, wherein the zoom optical system satisfies the following conditional expression: 1.00<(−f5)/fw<16.00 where f5: a focal length of the fifth lens group, and fw: a focal length of the zoom optical system in the wide angle end state.
 27. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group; and a sixth lens group, wherein the zoom optical system satisfies the following conditional expression: 1.00<Mv5/Mv6<3.00 where Mv5: an amount of movement of the fifth lens group upon zooming from the wide angle end state to a telephoto end state (a sign of the amount of movement toward an object is shown as +), and Mv6: an amount of movement of the sixth lens group upon zooming from the wide angle end state to the telephoto end state (the sign of the amount of movement toward an object is shown as +).
 28. The zoom optical system according to claim 1, wherein upon zooming, the first lens group moves with respect to the image surface.
 29. The zoom optical system according to claim 1, wherein the first lens group consists of three or more lenses.
 30. The zoom optical system according to claim 1, wherein the zoom optical system satisfies the following conditional expression: 0.30<Mv1/(ft−fw)<0.80 where Mv1: an amount of movement of the first lens group upon zooming from the wide angle end state to a telephoto end state (a sign of the amount of movement toward an object is shown as +), ft: a focal length of the zoom optical system in the telephoto end state, and fw: a focal length of the zoom optical system in the wide angle end state.
 31. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group; and a sixth lens group, wherein an air lens is provided in the sixth lens group, and the zoom optical system satisfies the following conditional expression: 0.00<(RAr2+RAr1)/(RAr2−RAr1)<2.00 where RAr1: a radius of curvature of an object-side lens surface of the air lens of the sixth lens group, and RAr2: a radius of curvature of an image-side lens surface of the air lens of the sixth lens group.
 32. The zoom optical system according to claim 1, comprising, in order from the object: the first lens group; the second lens group; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group; and a sixth lens group, wherein upon zooming, at least the first lens group, the third lens group, the fourth lens group, the fifth lens group, and the sixth lens group move with respect to the image surface.
 33. The zoom optical system according to claim 1, wherein the lens groups moving upon zooming move toward the object upon zooming from the wide angle end state to the telephoto end state.
 34. An optical apparatus, comprising the zoom optical system according to claim 1 mounted thereon.
 35. A method for manufacturing a zoom optical system comprising, in order from an object: a first lens group having a positive refractive power; and a second lens group having a negative refractive power, the method comprising: arranging the lens groups in a lens barrel such that: upon zooming, a distance between the adjacent lens groups changes, configuring the zoom optical system to comprise an aperture stop disposed closer to an image than the second lens group, and satisfying the following conditional expression: 0.10<Df/Dr<0.90 where Df: a distance to the aperture stop from a lens surface of the zoom optical system closest to an object in a wide angle end state, and Dr: a distance from the aperture stop to a lens surface of the zoom optical system closest to the image in the wide angle end state. 